分解因式:3(x+y)(x-y)-6(y-x)²

问题描述:

分解因式:3(x+y)(x-y)-6(y-x)²

3(x+y)(x-y)-6(y-x)²
=3(x+y)(x-y)-6(x-y)²
=3(x-y)(x+y-2(x-y))
=3(x-y)(3y-x)