(3a十4b)(3a一4b)谢谢了,

问题描述:

(3a十4b)(3a一4b)谢谢了,

(3a十4b)(3a一4b)
原式=(3a)²-(4b)²
=9a²-16b²
楼主,我也是初一的学生,老师之前才教过,我写的不会错的,请采纳我吧,O(∩_∩)O谢谢!