x³-2x²（y-x）+x（y-z）²
=x(x²-2xy+2x²+y²-2yz+z²)
=x(-x²-2xy+y²-2yz+z²)还有呢，答案是x（x-y+z）²不可能的，你写漏了卷子的答案是这样的呀？错了