因式分解:3(x-y)^3-9x(y-x)^2
问题描述:
因式分解:3(x-y)^3-9x(y-x)^2
答
3(x-y)^3-9x(y-x)^2
=3(x-y)^2(x-y-3x)
=-3(x-y)^2(2x+y)