分解因式:[(x-1)+(y-xy)]²怎样变成[(x-1)*(1-y)]²

问题描述:

分解因式:[(x-1)+(y-xy)]²怎样变成[(x-1)*(1-y)]²

[ (x - 1) + (y - xy) ]"
= [ (x - 1) - (xy - y) ]"
= [ (x - 1) - y(x - 1) ]"
= [ (x - 1)(1 - y) ]"