x方(x-y)+(y方-x方)因式分解
问题描述：
x方(x-y)+(y方-x方)因式分解
答
x²(x-y)+(y²-x²)
=x²(x-y)+(y+x)(y-x)
=x²(x-y)-(x+y)(x-y)
=(x-y)[x²-(x+y)]
=(x-y)(x²-x+y)