Question

因式分解9a^2(x-y)+4b^2(y-x)

Answer 1

解：原式=9a^2(x-y)-4b^2(x-y)
=(9a^2-4b^2)(x-y)
=(x-y)(3a-2b)(3a+2b)
可以提一个负号，形成（x-y）的相反数（y-x）在进行因式分解
ps：要自己动脑筋啊，不动脑筋想会越来越难蛤，这是有点难，要多练，跟初二初三的学习都紧密相连，学不好要吃大亏哦

Answer 2

9a^2(x-y)+4b^2(y-x)
=（x-y）*（9a^2-4b^2)
=(x-y)*(3a+2b)*(3a-2b)

Answer 3

9a^2(x-y)+4b^2(y-x)
=9a^2(x-y)-4b^2(x-y)
=(x-y)(9a^2-4b^2)
=(x-y)(3a+2b)(3a-2b)