问题描述： x²-x²y+xy²-x+y-y²,让我看得懂 1个回答 分类：数学 2014-10-04 问题解答： 我来补答 x²-x²y+xy²-x+y-y²=(x²-y²)-(x²y-xy²)-(x-y)=(x-y)(x+y)-xy(x-y)-(x-y)=(x-y)(x+y-xy-1)=-(x-y)(xy-x-y+1)=-(x-y)[(xy-x)-(y-1)]=-(x-y)[x(y-1)-(y-1)]=-(x-y)(x-1)(y-1) 展开全文阅读
