因式分解题、数学高手来.全对给50分
(x-y)²-(x-y)³
(x-y)²-(y-x)³
2(x-y)-.3(y-x)²
4ab(a+b)²-6a²b(a+b)
(x+y)²(x-y)+(x+y)(x-y)²
2a(a-3)²-6a²(3-a)+8a(a-3)
24xy²z²(x+y-z)-32xyz(z-x-y)²+8xyz³(z-x-y)