求文档:分解因式：xy-1+x-yx(y+1)-(y+1)怎样化为x-1)(y+1)
问题描述：
求文档:分解因式：xy-1+x-y
x(y+1)-(y+1)怎样化为x-1)(y+1)
答
=x(y+1)-(y+1)
=(x-1)(y+1)