分解因式:xy-x-y+1=_.
问题描述:
分解因式:xy-x-y+1=______.
答
xy-x-y+1,
=x(y-1)-(y-1),
=(x-1)(y-1).
分解因式:xy-x-y+1=______.
xy-x-y+1,
=x(y-1)-(y-1),
=(x-1)(y-1).