小学1-6年级全科同步教学视频
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https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 通用版1年级数学奥数视频
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https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 北师大6年级数学上册 (教学视频)
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https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.1 平行四边形的面积计算.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 5.7 积的近似值.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.5 认识平方千米.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 5.8 被除数的小数位数多于除数的计算.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 5.2 小数点向右移动引起小数大小变化的规律.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 5.9 被除数的小数位数少于除数的计算.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.8 整理与练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.7 用数一数和算一算的方法求图形的面积.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 5.6 积的小数位数不够的小数乘法.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.3 梯形的面积计算.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 1.1 正、负数的初步认识.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.1 小数的意义.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 5.5 小数乘小数的计算方法.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.6 小数的近似数.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.1 解决问题的策略（1）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 5.10 认识循环小数和求商的近似值.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.3 用计算器计算小数加法和减法.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 5.1 小数乘整数.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.2 复式条形统计图.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.2 解决问题的策略（2）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 8.1 用含字母的式子表示简单的数量关系.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 5.11 用“去尾”法和“进一”法求商的近似值.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.2 三角形的面积计算.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 8.3 化简含有字母的式子.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.6 不规则图形的面积计算.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.4 认识公顷.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.2 被减数的小数位数比减数少的减法.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.2 小数的计数单位、读写和组成.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 8.2 用含字母的式子表示较复杂的数量关系.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.7 整理与练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 1.2 用正，负数表示具有相反意义的量.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 5.12 小数四则混合运算.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.5 用“万”或“亿”作单位表示大数.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.4 小数的大小比较.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.3 小数的性质.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.1 小数的加减计算.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 5.3 除数是整数的小数除法.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.1 复式统计表.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 5.4 小数点向左移动引起小数大小变化的规律.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 5.13 整理与练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.1 认识平均分、每几个分一份求份数.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.6 复习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.5 “9”的乘法口诀和用口诀求商.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 5.3 认识米.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 1.3 简单的加减实际问题1.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.6 乘法口诀表.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.4 除法的初步认识.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.2 用7的乘法口诀求商.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.3 “5”的乘法口诀.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.4 用8的乘法口诀求商.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.3 把物体平均分.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.1 四边形、五边形和六边形的初步认识.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.3 “8”的乘法口诀.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.6 复习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 1.1 连加、连减.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.2 “1-4”的乘法口诀.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.1 从前、后、左、右观察物体.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 5.2 认识厘米.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.1 “ 7 ” 的乘法口诀.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.4 乘加、乘减.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.2 认识平行四边形.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.1 乘法的初步认识.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.5 “6”的乘法口诀.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 1.2 加减混合运算.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.7 连乘、连除和乘除混合运算.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.5 用1-6的乘法口诀求商.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.2 平均分成几份，求每份是几.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.8 复习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 5.1 线段的初步认识.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.1 圆柱和圆锥的特征.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.13 练习与应用1.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.4 反比例的意义练习（1）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.9 圆锥的体积.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.2.3 复习平面图形的周长和面积（1）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 1.4 选择统计图描述数据练习2.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 5.4 用方向和距离描述简单的行走路线.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.1 正比例的意义.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.2.5 复习平面图形的周长和面积（3）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.7 大树有多高.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.3 圆柱的侧面积和表面积的练习1.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.1.3 复习分数和百分数的认识（1）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.5 解比例.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.6 圆柱的体积的练习1.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.1.8 解决问题的策略总复习（1）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.10 圆锥的体积的练习1.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.12 回顾与整理.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.8 圆柱的体积的练习3.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.1.5 常见的量整理与复习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.1.1 复习整数和小数的认识（1）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.3 比例的意义练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.1.10 解决问题的策略总复习（3）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.1.13 复习正比例和反比例（1）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.11 面积的变化.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.1.14 复习正比例和反比例（2）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.3.2 统计总复习（2）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.4 比例的基本性质.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.2.10 立体图形表面积和体积总复习（4）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.9 比例尺及其应用练习（1）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.6 正比例和反比例的综合练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.5 反比例的意义练习（2）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.1.9 解决问题的策略总复习（2）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.2.9 立体图形表面积和体积总复习（3）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.3 选择策略解决实际问题练习（1）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.1 图形的放大与缩小.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.2 圆柱的侧面积和表面积.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.4.3 绘制平面图.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.2.7 复习立体图形的表面积和体积（1）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 5.3 根据方向和距离在平面图表示物体的位置.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.6 解比例练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.1.6 四则运算整理与复习（1）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.4.1 制定旅游计划（1）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 1.3 选择统计图描述数据练习1.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.1.11 式与方程总复习（1）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.3 反比例的意义.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.11 圆锥的体积的练习2.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.2 正比例的图像.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.1.12 式与方程总复习（2）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.14 练习与应用2.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.2.1 复习平面图形的认识（1）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.2.8 复习立体图形的表面积和体积（2）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.10 比例尺及其应用练习（2）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 1.1 认识扇形统计图.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.2.6 复习立体图形的认识.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.7 比例尺的意义.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.5 圆柱的体积.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.4.2 制定旅游计划（2）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.1 选择策略解决实际问题.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.4 圆柱的侧面积和表面积的练习2.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 5.2 用方向和距离确定位置的练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.2.4 复习平面图形的周长和面积（2）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.1.7 四则运算整理与复习（2）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.4 选择策略解决实际问题练习（2）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.3.1 统计总复习（1）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.2.12 图形与位置总复习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.2.2 复习平面图形的认识（2）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.1.4 复习分数和百分数的认识（2）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 1.2 选择统计图描述数据.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.7 圆柱的体积的练习2.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.2 比例的意义.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.5 选择策略解决实际问题练习（3）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.3.3 复习可能性.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.8 比例尺的实际应用.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.2 选择策略解决实际问题（2）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.2.11 图形的运动总复习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 5.1 用方向和距离描述物体的位置.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.1.2 复习整数和小数的认识（2）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 1.2 列方程解决实际问题 二_01.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.6 长方体和正方体的体积_01.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.9 整理与练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.5 百分率的意义和计算.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.1 百分数的意义.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.9 表面积的变化_01.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.2 求一个数的几分之几是多少_01.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.5 分数连除和乘除混合.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.5 体积单位_01.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.4 列方程解决实际问题.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.3 长方体和正方体的表面积_01.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.2 解决问题的策略（2）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.8 利息.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.4 体积和容积_01.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.6 比的意义.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.3 分数乘分数_01.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.2 长方体和正方体的侧面展开图_01.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.2 百分数与小数的互化.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 5.2 稍复杂的分数乘法实际问题（1）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 1.1 列方程解决实际问题 一_01.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.7 长方体和正方体的体积公式的统一_01.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.7 纳税.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.4求一个数是另一个数的百分之几的实际问题.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.9 折扣.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.7 比的基本性质及化简.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.8 按比分配的实际问题.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.10 解决稍复杂的百分数实际问题(一).mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 5.3 稍复杂的分数乘法实际问题（2）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.1 长方体和正方体的认识_01.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.3 百分数与分数的互化.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.1 分数与整数相乘_01.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.1 解决问题的策略（1）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.8 体积单位间的进率_01.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.6 解决稍复杂的百分数实际问题(一).mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 1.8 乘数末尾有0的乘法.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.2 认识周长.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.1 平移和旋转.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.2 认识一个物体的几分之几.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 1.1 整十、整百数乘一位数.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.9 复习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.6 笔算三位数除以一位数（首位不够除）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.2 轴对称图形.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.1 认识千克.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.8 商里有0的除法.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.1 认识长方形和正方形.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 1.7 乘数中间有0的乘法.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.2 认识克、千克与克的换算.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 1.5 不连续进位乘.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 1.9 复习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 5.2 从条件出发思考的策略（二）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.3 长方形和正方形周长的计算.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 1.6 连续进位乘.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.3 除法的验算.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 1.4 不进位乘.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.1 整十、整百数除以一位数的口算.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.7 被除数里有0的除法.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.5 笔算三位数除以一位数（首位不能整除）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.1 认识一个物体的几分之一.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.4 笔算两位数除以一位数（首位不能整除）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.3 简单的分数加、减法.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 1.2 倍的认识和有关倍的简单实际问题1_01.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 1.3 有关倍的简单实际问题.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 5.1 从条件出发思考的策略（一）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.15 复习（1）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.3 100以内的加、减法（笔算）及其应用复习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.3 两位数加整十数、一位数（不进位）练习（2）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.2 认识长方形、正方形、三角形和圆复习 练习四.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.4 求被减数的实际问题.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 04. 十几减8、7.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.6 100以内数的大小比较.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.11 我们认识的数.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.15 复习（2）笔算复习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.12 求两数相差多少的实际问题.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.14 复习（1）口算复习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 5.2 认识大于1元的人民币.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.12 练习十四（1）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 06. 十几减8、7 练习（2）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 07. 十几减6、5、4、3、2.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.11 两位数减两位数（退位）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.1 认数、认图形和认识人民币复习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 02. 十几减9 练习（1）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.3 练习十一（2）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.13 练习九（1）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.10 认识100以内的数 复习（2）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.11 两位数加、减两位数（不进位、不退位）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.5 100以内数的顺序.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.8 两位数加两位数（进位）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.14 练习九（2）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.9 练习十三（1）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.13 练习十四（2）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.10 练习十三（2）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.4 练习五 100以内数的含义及读写练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.2 两位数加整十数、一位数（不进位）（1）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.7 练习十二（3）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.5 练习七.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.4 加、减法实际问题复习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.1 两位数加一位数（进位）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.7 多一些、少一些，多得多、少得多.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.5 练习十二（1）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.1 数数和数的含义.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 5.4 小小商店.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.6 两位数减整十数、一位数（不退位）（1）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 5.1 认识1元以内的人民币.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.2 读数、写数.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.16 复习（2）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.1 整十数加、减整十数.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.2 100以内的加、减法（口算）及其 应用复习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.1 认识长方形、正方形、三角形和圆.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.2 练习十一（1）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 10. “20”以内的退位减法 复习（2）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 03. 十几减9 练习（2）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 05. 十几减8、7 练习（1）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.3 整十数加一位数及相应的减法.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.7 两位数减整十数、一位数（不退位）（2）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.8 求减数的实际问题.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.10 练习八（2）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.8 练习六 100以内数的顺序和大小比较练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 08. 十几减6、5、4、3、2 练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 5.3 练习十.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 09. “20”以内的退位减法 复习（1）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 01. 十几减9.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.4 两位数减一位数（退位）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.6 练习十二（2）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.9 认识100以内的数 复习（1）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.9 练习八（1）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.1 加法交换律和结合律.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.2 用计算器探索规律.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.1 认识整万数.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.1 认识计算器及其计算方法.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.6 三角形的练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.5 等腰三角形和等边三角形.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 8.4 数字与信息.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.7 乘法运算律练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 1.2 图形的旋转.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 8.2 用数对表示点的位置.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.8 相遇求路程的实际问题.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.2 三角形的三边关系.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.7 认识平行四边形.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.1 认识三角形.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.3 三角形内角和.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 1.3 认识轴对称.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 1.4 平移、旋转和轴对称练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.4 积的变化规律 截取视频.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.2 常见的数量关系.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.8 一亿有多大.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.6 应用乘法运算律进行简便计算.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.5 乘数末尾有0的乘法笔算.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.6 乘数末尾有0的乘法练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.11 多边形内角和.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.3 加法运算律练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.4 三角形的分类.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.8 认识梯形.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.5 数的改写和大小比较.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.3 用计算器计算练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 1.1 图形的平移.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 5.2 用画图的策略解决问题（2）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.5 乘法分配律.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.4 认识含有亿级和万级的数.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.9 平行四边形和梯形的练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 5.1 用画图的策略解决问题（1）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.4 乘法交换律、结合律和简便计算.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.3 认识整亿数.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.7 三位数乘两位数整理与练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.3 乘法笔算和常见数量关系练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.10 运算律整理与练习（1）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.10 三角形、平行四边形和梯形整理与练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.1 三位数乘两位数 的笔算.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 5.3 解决问题的策略练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.6 近似数.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 8.3 确定位置练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 8.1 用数对表示物体位置.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.7 认识多位数整理与练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.11 运算律整理与练习（2）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.2 认识含有万级和个级的数.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.9 解决实际问题练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.2 应用加法运算律进行简便计算.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.5 试商后需要调商的笔算除法（1）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 8.3 角的分类和画角.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 8.1 认识射线、直线和角.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 1.2 认识毫升、升与毫升的互化.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 1.1 容量的含义、认识升.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.3 平均数.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 5.1 解决问题的策略（1）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.1 从不同方向观察同一物体.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.9 整理与练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.7 商不变的规律.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.8 被除数、除数末尾都有0的除法.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.3 用“四舍五入”法试商.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.1 制作统计表和条形统计图.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 8.6 认识平行线、画平行线.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.3 拼搭和观察不规则立体图形.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.4 连除的实际问题.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.2 三位数除以整十数.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.3 含有中括号的混合运算.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.1 除数是整十数商是一位数.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.2 从不同方向观察立体图形.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 8.4 认识垂直、点到直线的距离.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 8.2 角的度量.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 8.5 画垂线.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.2 含有小括号的混合运算.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 5.2 解决问题的策略（2）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.6 试商后需要调商的笔算除法（2）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.1 可能性.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 8.7 整理与练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.1 不含括号的混合运算.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.2 数据的分段整理.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 8.2 简单的数据调查与分类整理.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.6 三位数减法的笔算（不连续退位减）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.2 100以内两位数减两位数的口算.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.5 三位数加法的笔算（连续进位加）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 03. 认识整时和认识时、分.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 8.1 简单的数据收集与分类整理.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 5.1 认识分米和毫米.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 5.2 简单的单位换算.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.1 角的初步认识.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 01. 有余数除法的意义.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 02. 有余数除法的意义.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.2 认识平面图上的东、南、西、北.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.4 综合与实践.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.4 万以内中间有0的数的写法和读法.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 04. 认识几时几分.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.8 三位数减法的笔算（连续退位减）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.2 直角的初步认识.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.1 数数和千以内数的组成.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.1 100以内两位数加两位数的口算.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.3 认识万以内的数.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.7 三位数减法的笔算（隔位退位减）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.4 三位数加法的笔算（不连续进位加）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.1 认识东、南、西、北.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.5 万以内数的大小比较.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.3 认识东北、西北、东南、西南.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.6 简单的近似数（接近几百、几千的数）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.2 用算盘表示数.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 05. 认识秒.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 8.3 综合与实践.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.3 两步计算的加、减法实际问题.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 1.2 等式性质（1）与解方程.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.9 最小公倍数.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 5.3 分数的加、减计算及应用练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 8.2 因数和倍数、分数的意义和性质、分数加法和减法复习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.1 因数和倍数的认识.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.11 因数和倍数的认识及应用整理和练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.15 球的反弹高度.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.1 分数与除法的关系.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.10 圆的周长、面积计算及应用整理和练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.9 约分练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.4 圆周率和圆的周长公式.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.3 扇形的认识.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.11 图形的运动总复习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.2 求一个数是另一个数的几分之几.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.8 圆的面积计算及应用练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.10 通分.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 1.1 等式与方程的含义.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.5 假分数化整数或带分数.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 1.3 等式性质（2）与解方程.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.6 分数与小数的互化.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 8.1 解方程及应用整理和复习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.2 用转化的策略求和.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 1.12 列方程解决实际问题整理和练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.7 公因数和最大公因数.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 1.7 解方程和列方程解决实际问题练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.4 和与积的奇偶性.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.12 公因数和公倍数的认识及应用整理和练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.14 分数的基本性质及应用整理和练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.13 分数的意义及应用整理和练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.5 质数和合数.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.3 3的倍数的特征.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.1 用转化的策略解决问题练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 5.1 异分母分数加减法.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.8 约分.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.2 2和5的倍数的特征.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.10 公倍数和最小公倍数练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.3 分数的意义练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 1.11 方程含义解方程整理和练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.7 圆的组合图形的面积计算.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.5 圆周率和圆的周长公式.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 8.4 综合应用方程、分数、圆、统计图等知识解决问题.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.4 真分数和假分数.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.9 圆的特征、周长、面积整理和练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.13 和与积的奇偶性.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.6 质因数和分解质因数.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 1.4 用等式性质解方程练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 1.6 列方程解决两步计算实际问题.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 1.5 列方程解决一步计算实际问题.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.8 公因数和最大公因数练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.1 圆的认识.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.12 分数大小比较练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.3 线统计图的认识和应用练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 5.4 分数连加、连减和加减混合运算及应用练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.1 单式折线统计图的认识和应用.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.4 因数和倍数的练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.2 圆的认识练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 1.8 列方程解决稍复杂的实际问题.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.7 分数的基本性质.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 1.10 列方程解决实际问题练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 8.3 圆的特征、周长、面积整理和复习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.2 复式折线统计图的认识和应用.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 1.9 列方程解三步计算实际问题.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.6 圆的面积计算.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 5.2 分数的连加、连减和加减混合.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.3 从问题出发分析并解决实际问题练习（1）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.2 面积单位的认识.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 10.4 长方形和正方形的面积复习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 9.1 简单的数据汇总.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 9.4 上学时间.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.1 认识千米.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.1 从问题出发分析并解决实际问题（1）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.4 从问题出发分析并解决实际问题练习（2）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 8.2 一位小数的大小比较.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 03. 进位的两位数乘两位数的笔算.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.4 长方形和正方形的面积计算.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.6 算“24点”.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 10.5 解决问题的策略、数据的收集和整理复习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 5.6 24时记时法的认识及应用练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 9.2 简单的数据排序和分组.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 10. 有趣的乘法.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 04. 两位数乘两位数的估算及应用练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.2 从问题出发分析并解决实际问题（2）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.1 认识一个整体的几分之一.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 5.5 求简单的经过时间.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.6 一个整体的几分之一和几分之几的认识及应用练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.5 长方形和正方形的面积计算练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 10.2 年、月、日和千米、吨复习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.2 认识吨.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.7 面积单位的进率及应用练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 5.3 年、月、日的认识及应用练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 08. 两位数乘两位数的计算及应用复习（1）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.3 认识一个整体的几分之几.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.2 除法和加、减法的两步混合运算（不含小括号）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.4 认识一个整体的几分之几练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.8 面积、面积单位和面积计算复习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.5 求一个数的几分之几是多少.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 9.3 简单的数据汇总、排序、分组练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 8.4 小数的初步认识练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 07. 用两步连乘解决实际问题.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 06. 乘数末尾有0的两位数乘两位数.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 5.4 认识24时记时法.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 10.3 分数、小数的初步认识复习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.3 千米和吨的认识练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 02. 不进位的两位数乘两位数的笔算.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.4 两步混合运算及应用练习（1）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.1 面积的含义.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.3 含有小括号的两步混合运算.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 09. 两位数乘两位数的计算及应用复习（2）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 10.1 两位数乘两位数、两步混合运算复习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.9 长方形和长方形的周长、面积计算及应用复习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.6 面积单位的进率.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 5.2 认识平年和闰年.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 8.1 小数的含义和读写.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 8.3 简单的小数加、减法.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 5.1 认识年、月、日.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 05. 两位数乘两位数的笔算及应用练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.5 两步混合运算及应用练习（1）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.2 求一个数的几分之一是多少.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.3 面积含义和面积单位的认识练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 01. 两位数乘两位数的口算、估算.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 10.2 “ 8、7 ” 加几.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.2 “6、7”的分与合.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 9.1 数数、读数.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 5.2 认识几和第几.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 5.4 认识“＞”“＜”和“=”.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 8.8 得数是9的加法与9减几.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 8.9 得数是10的加法与10减几.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 1.1 数10以内的数.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 8.6 得数是8的加法与8减几.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.1 比较物体.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 9.2 数的组成、写数.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 8.5 “ 6、7 ” 减几.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 10.1 “ 9 ” 加几.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 8.1 “5”以内的加法.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 10.4 复习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.4 “10”的分与合.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 8.13 复习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 6.1 认识立体图形.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 5.3 认识0.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.1 “2-5”的分与合.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 8.11 “ 10 ” 以内的连加、连减.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 9.3 “ 10 ” 加几和相应的减法.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 5.6 认识10.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 5.5 认识6-9.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.1 根据给定的标准分类.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 5.1 认识1-5.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 8.12 “ 10 ” 以内的加减混合.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 8.4 得数是6、7的加法.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 8.3 有关0的加减法.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 10.3 “ 6、5、4、3、2 ” 加几.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 4.1 认识上下、前后、左右.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 8.10 求未知加数.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 8.7 看图解决问题.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 8.2 “ 5 ” 以内的减法.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 7.3 “8、9”的分与合.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 人教版3年级科学上册 (教学视频)
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 人教版2年级科学上册 (教学视频)
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 人教版4年级科学下册 (教学视频)
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 人教版6年级科学下册 (教学视频)
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 人教版1年级科学上册 (教学视频)
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 人教版6年级科学上册 (教学视频)
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 人教版5年级科学上册 (教学视频)
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 人教版4年级科学上册 (教学视频)
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 人教版2年级科学下册 (教学视频)
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 人教版5年级科学下册 (教学视频)
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 人教版1年级科学下册 (教学视频)
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 人教版3年级科学下册 (教学视频)
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 部编版4年级上册生字视频
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 部编版3年级上册生字视频
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 部编版5年级下册生字视频
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 部编版5年级上册生字视频
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 部编版6年级上册生字视频
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 部编版1年级下册生字视频
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 部编版2年级上册生字视频
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 部编版3年级下册生字视频
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 部编版2年级下册生字视频
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 部编版6年级下册生字视频
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 部编版4年级下册生字视频
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 部编版1年级上册生字视频
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 教科版6年级科学上册 (教学视频)
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 教科版1年级科学上册 (教学视频)
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 教科版3年级科学下册 (教学视频)
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 教科版5年级科学下册 (教学视频)
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 教科版4年级科学上册 (教学视频)
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 教科版2年级科学下册 (教学视频)
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 教科版3年级科学上册 (教学视频)
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 教科版5年级科学上册 (教学视频)
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 教科版4年级科学下册 (教学视频)
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 教科版6年级科学下册 (教学视频)
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 教科版2年级科学上册 (教学视频)
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 教科版1年级科学下册 (教学视频)
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.5 一袋空气的质量是多少.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.1 感受空气.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.6 我们来做“热气球”.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.8 空气和我们的生活.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.2 认识气温计.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.7 风的成因.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.4 测量降水量.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 1.7 混合与分离.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 1.1 水到哪里去了.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.1 我们关心天气.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 1.4 冰融化了.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.6 观察云.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.2 空气能占据空间吗.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.5 观测风.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 1.5 水能溶解多少物质.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.4 空气有质量吗.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 1.2 水沸腾了.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 1.3 水结冰了.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 2.3 压缩空气.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 1.6 加快溶解.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 3.3 测量气温.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 人教版3年级体育上册 (教学视频)
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 人教版6年级体育上册 (教学视频)
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 人教版4年级体育上册 (教学视频)
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 人教版2年级体育上册 (教学视频)
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 人教版5年级体育上册 (教学视频)
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 人教版4年级体育下册 (教学视频)
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 人教版1年级体育上册 (教学视频)
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 人教版1年级体育下册 (教学视频)
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 人教版6年级体育下册 (教学视频)
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 人教版3年级体育下册 (教学视频)
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 人教版5年级体育下册 (教学视频)
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 人教版2年级体育下册 (教学视频)
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 人美版4年级美术上册 (教学视频)
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 人美版5年级美术上册 (教学视频)
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 人美版6年级美术上册 (教学视频)
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 人美版1年级美术下册 (教学视频)
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 人美版4年级美术下册 (教学视频)
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 人美版2年级美术上册 (教学视频)
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 人美版6年级美术下册 (教学视频)
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 人美版3年级美术下册 (教学视频)
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 人美版5年级美术下册 (教学视频)
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 人美版1年级美术上册 (教学视频)
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 人美版2年级美术下册 (教学视频)
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 人美版3年级美术上册 (教学视频)
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 部编版1年级语文上册 (教学视频）
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 部编版6年级语文上册 (教学视频）
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 部编版4年级语文下册 (教学视频)
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 部编版3年级语文下册 (教学视频)
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 部编版4年级语文上册 (教学视频）
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 部编版3年级语文上册 (教学视频)
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 部编版1年级语文下册 (教学视频）
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 部编版2年级语文下册 (教学视频)
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 部编版6年级语文下册 (教学视频)
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 部编版5年级语文上册 (教学视频）
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 部编版2年级语文上册 (教学视频)
https://cdn.ldstatic.com/images/emoji/twemoji/file_folder.png?v=15 部编版5年级语文下册 (教学视频)
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 39 千以内数的认识（2）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 36 有余数的除法练习（2）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 46 万以内数的认识练习（1）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 45 万以内数的认识——近似数.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 01 数据收集与整理.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 05 除法的初步认识.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 42 万以内数的认识——读数.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 38 千以内数的认识（1）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 24 混合运算（例3）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 19 用除法解决问题.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 35 有余数的除法（例6）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 06 除法的初步认识练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 26 解决问题（例4）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 23 混合运算（例2）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 54 数学广角练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 15 解决问题.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 13 轴对称图形的认识.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 44 万以内数的认识——比大小.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 16 图形的运动综合练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 47 整百、整千数加减法.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 09 用除法解决问题.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 30 有余数的除法（例2）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 17 用7—9的口诀求商.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 34 有余数的除法（例5）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 53 数学广角—推理（例2）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 50 克和千克（例1、例2）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 11 除法认识的整理与复习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 21 表内除法（二）整理和复习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 48 用估算解决问题.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 40 千以内数的认识（3）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 27 解决问题练习课.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 28 混合运算整理和复习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 33 有余数的除法练习（1）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 12 表内除法（一）综合练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 04 平均分（第二课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 32 有余数的除法（例4）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 49 万以内数的认识练习（2）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 31 有余数的除法（例3）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 08 用口诀求商练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 10 解决问题练习课.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 51 克和千克（例3）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 18 用口诀求商练习课.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 41 10000以内数的认识.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 14 平移与旋转.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 43 万以内数的认识——写数.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 37 小小设计师.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 07 用2—6的口诀求商.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 25 混合运算练习课.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 02 数据收集与整理练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 52 数学广角—推理（例1）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 29 有余数的除法（例1）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 20 除法练习课.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 22 混合运算（例1）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 03 平均分（第一课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 48 三角形的面积（第2课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 29 用字母表示数（第3课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 56 植树问题（第3课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 39 实际问题与方程（第1课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 22 小数乘除法的整理和复习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 41 实际问题与方程（第3课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 16 一个数除以小数(第2课时).mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 49 梯形的面积（第1课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 37 解方程（第4课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 53 多边形的面积整理和复习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 10 位置(第1课时).mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 19 循环小数.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 09 解决问题(第2课时).mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 40 实际问题与方程（第2课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 43 实际问题与方程（第5课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 21 解决问题.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 31 用字母表示数（第5课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 18 商的近似数.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 15 一个数除以小数(第1课时).mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 32 方程的意义.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 42 实际问题与方程（第4课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 44 简易方程整理和复习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 27 用字母表示数（第1课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 04 小数乘小数(第2课时).mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 17 一个数除以小数(第3课时).mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 11 位置(第2课时).mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 06 积的近似数.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 01 小数乘整数(第1课时).mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 13 除数是整数的小数除法(2).mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 24 可能性（第2课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 20 用计算器探索规律.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 14 除数是整数的小数除法(3).mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 38 解方程（第5课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 51 组合图形的面积.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 12 除数是整数的小数除法(1).mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 28 用字母表示数（第2课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 33 等式的性质.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 46 平行四边形的面积（第2课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 07 整数乘法运算定律推广到小数.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 23 可能性（第1课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 54 植树问题（第1课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 50 梯形的面积（第2课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 52 解决问题.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 03 小数乘小数(第1课时).mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 36 解方程（第3课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 55 植树问题（第2课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 45 平行四边形的面积（第1课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 47 三角形的面积（第1课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 02 小数乘整数(第2课时).mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 57 植树问题（第4课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 26 掷一掷.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 05 小数乘小数(第3课时).mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 35 解方程（第2课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 25 可能性（第3课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 30 用字母表示数（第4课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 08 解决问题(第1课时).mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 34 解方程（第1课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 19 万以内加减法（二）（第4课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 32 多位数乘一位数笔算（第2课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 33 多位数乘一位数笔算（第3课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 09 毫米的认识.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 01 时、分、秒（第1课时）认识秒.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 29 多位数乘一位数口算乘法（二）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 41 数字编码.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 53 分数的简单应用（第1课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 42 四边形的认识.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 38 解决问题（第3课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 30 多位数乘一位数口算乘法（三）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 51 分数的简单计算（第1课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 49 分数的初步认识（第2课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 05 万以内加减法（一）第2课时.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 36 解决问题（第1课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 39 整理与复习（第1课时).mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 50 比较分数的大小.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 03 计算经过时间.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 57 数学广角-集合（第2课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 24 倍的认识.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 48 分数的初步认识（第1课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 45 长方形和正方形的周长.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 37 解决问题（第2课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 28 多位数乘一位数口算乘法（一）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 27 倍的认识综合练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 16 万以内加减法（二）（第1课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 20 万以内加减法（二）（第5课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 14 吨的认识(第2课时).mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 22 解决问题（第2课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 06 万以内加减法（一）第3课时.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 13 吨的认识(第1课时).mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 43 长方形和正方形的认识.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 55 整理与复习 （第2课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 34 多位数乘一位数笔算（第4课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 23 整理与复习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 25 求一个数是另一个数的几倍.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 35 多位数乘一位数笔算（第5课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 02 时、分、秒（2）时间单位的换算.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 08 万以内加减法（一）整理与复习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 21 解决问题（第1课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 40 整理与复习（第2课时).mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 52 分数的简单计算（第2课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 26 求一个数的几倍是多少.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 46 解决问题.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 18 万以内加减法（二）（第3课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 04 万以内加减法（一）第1课时.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 54 整理与复习 （第1课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 47 整理与复习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 11 千米的认识(第1课时).mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 12 千米的认识(第2课时).mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 31 多位数乘一位数笔算（第1课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 17 万以内加减法（二）（第2课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 10 分米的认识.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 15 整理与复习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 44 周长的认识.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 56 数学广角-集合 (第1课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 07 万以内加减法（一）解决问题.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 29 最大公因数（第一课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 24 分数与除法.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 12 长方体和正方体的表面积（第一课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 13 长方体和正方体的表面积（第二课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 45 同分母分数加、减法（第二课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 23 分数的意义.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 21 长方体和正方体单元整理.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 52 打电话.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 43 图形的欣赏与设计.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 32 约分（第二课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 14 长方体和正方体的表面积练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 42 图形的运动（三）旋转（第二课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 39 分数和小数的互化（第二课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 01 观察物体（三）例1、例2.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 38 分数和小数的互化（第一课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 36 通分（第二课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 28 分数的基本性质（第二课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 07 质数和合数.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 18 体积单位间的进率.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 47 异分母分数加、减法（第二课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 03 因数倍数的认识 例1、例2.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 16 长方体和正方体的体积（第一课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 19 容积和容积单位（第一课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 44 同分母分数加、减法（第一课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 41 图形的运动（三）旋转（第一课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 15 体积和体积单位.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 02 观察物体（三）练习一.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 10 长方体和正方体的认识（第一课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 51 分数加法和减法的单元复习整理.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 40 分数的意义和性质单元整理.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 37 约分和通分练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 31 约分（第一课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 05 “ 2、5 ” 的倍数特征.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 34 最小公倍数（第二课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 11 长方体和正方体的认识（第二课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 46 异分母分数加、减法（第一课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 17 长方体和正方体的体积（第二课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 22 探索图形.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 30 最大公因数（第二课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 33 最小公倍数（第一课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 50 分数加减混合运算（第三课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 27 分数的基本性质（第一课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 08 奇偶性.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 09 因数倍数单元整理.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 25 真分数和假分数（第一课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 48 分数加减混合运算（第一课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 35 通分（第一课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 26 真分数和假分数（第二课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 04 因数倍数的认识 练习二.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 20 容积和容积单位（第二课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 49 分数加减混合运算（第二课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 06 “ 3 ” 的倍数特征.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 14 公顷和平方千米(第1课时).mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 11 整理和复习(第1课时).mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 17 角的度量（第1课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 10 用计算工具计算.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 04 亿以内数的改写(第1课时).mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 42 除数是两位数的笔算除法（8）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 23 积的变化规律.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 39 除数是两位数的笔算除法（5）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 50 条形统计图（第2课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 12 整理和复习(第2课时).mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 48 整理和复习（第2课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 47 整理和复习（第1课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 09 计算工具的认识.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 16 线段、直线、射线和角的认识.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 34 除数是两位数的口算除法.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 53 烙饼问题.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 44 商的变化规律（第2课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 06 数的产生与十进制计数法.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 43 商的变化规律（第1课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 07 亿以上数的读写法.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 02 亿以内数的读写法.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 08 亿以上数的改写.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 37 除数是两位数的笔算除法（3）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 05 亿以内数的改写(第2课时).mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 32 梯形的认识.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 51 解决问题.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 18 角的度量（第2课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 46 商的变化规律的应用（第2课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 28 平行与垂直（第2课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 33 神奇的莫比乌斯带.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 41 除数是两位数的笔算除法（7）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 13 “ 1 ” 亿有多大.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 40 除数是两位数的笔算除法（6）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 01 亿以内数的认识.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 20 画角.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 24 常见的数量关系（第1课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 31 平行四边形的认识（第2课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 03 亿以内数的大小比较.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 25 常见的数量关系（第2课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 29 解决问题.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 30 平行四边形的认识（第1课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 49 条形统计图（第1课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 27 平行与垂直（第1课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 21 三位数乘两位数笔算（第1课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 38 除数是两位数的笔算除法（4）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 22 三位数乘两位数笔算（第2课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 26 整理和复习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 54 田忌赛马.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 15 公顷和平方千米(第2课时).mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 35 除数是两位数的笔算除法（1）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 52 沏茶问题.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 36 除数是两位数的笔算除法（2）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 19 角的分类.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 45 商的变化规律的应用（第1课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 47 复式条形统计图.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 06 观察物体.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 02 乘除法的意义和各部分间的关系.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 25 小数与单位换算.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 05 解决问题.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 29 三角形的认识.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 14 除法的性质与简便计算.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 35 小数的加法和减法（一）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 11 减法的性质练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 10 减法的性质.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 33 四边形的内角和.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 41 轴对称.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 09 加法运算定律与简便计算.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 23 小数点的位置移动（练习）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 17 小数的意义.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 32 三角形的内角和.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 01 加减法的意义和各部分间的关系.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 15 简便计算练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 31 三角形的分类.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 24 解决问题.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 21 小数的意义和性质（练习）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 45 平均数.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 36 小数的加法和减法（二）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 27 小数的近似数（一）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 20 小数的大小比较.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 42 平移（一）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 46 平均数（练习）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 04 带括号的四则混合运算.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 08 加法交换律和结合律.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 39 小数加减混合运算与简算（练习）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 50 鸡兔同笼.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 34 三角形（复习）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 30 三角形三边的关系.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 22 小数点的位置移动.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 18 小数的读法和写法.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 37 小数加减混合运算.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 26 小数与单位换算（练习）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 40 小数的加法和减法（复习）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 44 图形的运动（复习）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 43 平移（二）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 07 观察物体的练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 38 小数加减简便计算.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 48 平均数与条形统计图.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 49 营养午餐.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 19 小数的性质.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 13 乘法分配律.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 12 乘法交换律和结合律.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 03 加减乘除的意义和各部分间关系的练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 28 小数的近似数（二）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 16 运算定律的复习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 10 加法的初步认识.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 36 “ 6～10” 的认识和加减法整理和复习1.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 21 “ 6、7” 的认识和加减法练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 53 解决问题（第2课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 23 解决问题（第2课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 13 “ 0 ” 的认识.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 34 加减混合.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 26 “ 8、9 ” 的分与合.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 15 “ 1-5 ” 的认识和加减法的整理和复习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 51 “ 5、4、3、2 ” 加几（二）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 19 “ 6、7” 的认识.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 18 解决问题.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 28 “ 8、9 ” 的认识和加减法练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 32 “ 10 ” 的认识和加减法练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 33 连加、连减.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 54 “ 20 ” 以内的进位加法整理和复习1.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 14 “ 0 ” 的加减法.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 05 1—5的认识.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 04 左、右.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 47 “ 9 ” 加几（第2课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 02 比多少.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 01 数一数.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 22 解决问题（第1课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 12 加、减法的初步认识练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 25 “ 8、9 ” 的认识.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 46 “ 9 ” 加几（第1课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 35 连加、连减、加减混合练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 52 解决问题（第1课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 24 解决问题（第3课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 03 上、下、前、后.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 27 “ 8、9 ” 的加减法.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 39 “ 11～20 ” 各数的认识（二）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 45 认识钟表练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 55 “ 20 ” 以内的进位加法整理和复习2.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 48 “ 8、7、6” 加几（第1课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 50 “ 5、4、3、2 ” 加几（一）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 44 认识钟表.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 40 “ 10 ” 加几及相应的减法.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 42 解决问题.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 17 认识立体图形（第2课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 16 认识立体图形(第1课时).mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 37 “ 6～10” 的认识和加减法整理和复习2.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 49 “ 8、7、6 ” 加几（第2课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 08 分与合.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 41 十几加几及相应的减法.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 38 “ 11～20 ” 各数的认识（一）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 30 “ 10 ” 的认识.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 29 解决问题.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 06 比大小.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 20 “ 6、7” 的分与合.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 43 数学乐园.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 11 减法的初步认识.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 07 第几.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 31 “ 10 ” 的加减法.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 09 “ 1-5 ” 的认识练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 34 比例单元整理和复习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 23 解比例.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 32 用比例解决问题.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 12 圆柱的表面积练习（一）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 11 圆柱的表面积.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 40 整理和复习的价值与方法.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 02 负数练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 65 整理和复习：数学思考（三）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 45 整理和复习：数的运算（一）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 21 比例的意义.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 13 圆柱的表面积练习（二）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 69 整理和复习：解决问题策略.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 36 黄金分割.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 58 整理和复习：图形与位置.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 37 鸽巢问题（一）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 43 整理和复习：数的认识（三）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 06 税率与利率练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 19 圆柱与圆锥单元复习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 38 鸽巢问题（二）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 61 整理和复习：统计与概率（二）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 26 正比例和反比例（二）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 57 整理和复习：图形的运动.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 52 整理和复习：比和比例（二）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 22 比例的基本性质.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 18 圆柱与圆锥练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 09 百分数复习整理.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 24 比例的意义和基本性质练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 64 整理和复习：数学思考（二）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 63 整理和复习：数学思考（一）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 31 图形的放大与缩小.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 20 立体图形整理.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 28 正比例和反比例练习（二）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 27 正比例和反比例练习（一）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 35 自行车里的数学.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 67 整理和复习：综合与实践（三）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 42 整理和复习：数的认识（二）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 59 整理和复习：常见的量.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 05 税率与利率.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 55 整理和复习：图形的认识与测量（三）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 48 整理和复习：数的运算（四）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 08 百分数综合练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 47 整理和复习：数的运算（三）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 15 圆柱的体积练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 50 整理和复习：式与方程（二）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 30 比例尺练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 51 整理和复习：比和比例（一）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 10 圆柱的认识.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 01 认识负数.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 17 圆锥的练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 49 整理和复习：式与方程（一）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 04 折扣与成数练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 39 鸽巢问题（三）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 33 用比例解决问题练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 46 整理和复习：数的运算（二）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 68 整理和复习：综合与实践（四）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 66 整理和复习：综合与实践（一）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 54 整理和复习：图形的认识与测量（二）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 44 整理和复习：数的认识（四）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 16 圆锥的认识.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 03 折扣与成数.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 56 整理和复习：图形的认识与测量（四）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 41 整理和复习：数的认识（一）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 60 整理和复习：统计与概率（一）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 62 整理和复习：统计与概率（三）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 14 圆柱的体积.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 25 正比例和反比例（一）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 07 百分数解决问题.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 29 比例尺.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 53 整理和复习：图形的认识与测量（一）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 12 解决问题(第2课时).mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 40 “ 7、8 ” 的乘法口诀练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 10 “ 100 ” 以内的减法练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 04 解决问题.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 54 搭配（第2课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 20 认识角.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 08 “ 100 ” 以内的不退位减法.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 47 表内乘法（二）整理和复习1.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 21 认识直角.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 15 两位数连加、连减和加减混合运算练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 01 认识厘米.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 43 “ 9 ” 的乘法口诀（第2课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 42 “ 9 ” 的乘法口诀（第1课时）.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 44 “ 9 ” 的乘法口诀练习.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 30 乘加、乘减.mp4
https://cdn.ldstatic.com/images/emoji/twemoji/page_facing_up.png?v=15 09 “ 100 ” 以内的退位减法.mp4
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