a(x-y)^3+b(y-x)^2 4x^3-6x^2-2x

问题描述:

a(x-y)^3+b(y-x)^2 4x^3-6x^2-2x

分解因式是吧:
a(x-y)^3+b(y-x)^2 
=a(x-y)^3+b(x-y)^2
=(x-y)^2·(ax-ay)+(x-y)^2·b
=(x-y)^2·(ax-ay+b)


4x^3-6x^2-2x
=2x(2x^2-3x-1)
有理数范围内只能到这里了