问题
填空题
计算:(x2-2x+1-y2)÷(x+y-1)=______.
答案
(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.
计算:(x2-2x+1-y2)÷(x+y-1)=______.
(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.