【同步课堂】人教版七年级数学（下）6.2--6.3：立方根、实数、实数的运算

4.立方根

https://v.qq.com/txp/iframe/player.html?vid=a0608fa0vl2&auto=0

5.实数

https://v.qq.com/txp/iframe/player.html?vid=r0608xyqwup&auto=0

6.实数的运算

https://v.qq.com/txp/iframe/player.html?vid=b0609qrean5&auto=0