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.

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