化简：x2-2xy+y2-1x-y-1=______．

题型：填空题难度：一般来源：东莞

化简：

x2-2xy+y2-1

x-y-1

=______．

答案

原式=

(x-y)2-1

x-y-1

=

(x-y+1)(x-y-1)

x-y-1

=x-y+1．