4x（x-y）²-12（y-x）³
问题描述：
4x（x-y）²-12（y-x）³
答
4x（x-y）²-12（y-x）³
=4x（x-y）²+12（x-y）³
=(x-y)²（4x+12x-12y)
=(x-y)²(16x-12y)
=4(x-y)²(4x-3y)