计算:(x2-2x+1-y2)÷(x+y-1)= _ .
问题描述:
计算:(x2-2x+1-y2)÷(x+y-1)= ___ .
答
(x2-2x+1-y2)÷(x+y-1),
=(x-1+y)(x-1-y)÷(x+y-1),
=x-y-1.
故应填:x-y-1.