x^3+x²y-xy²-y^3 =x^3-y^3+x²y-xy²=(x-y)(x²+xy+y²)+xy(x-y)=(x-y)(x²+2xy+y²)=(x-y)(x+y)²xz-yz-x²+2xy-y²=z(x-y)-(x-y)²=(x-y)(z-x+y)3 题目错了 如果后面是（x+m)(y+n)的话 选A
1。(x-y)(x+y)^22.(x-y)(z-x+y)3.A
