x-y-1分之x²-2xy+y²-1 化简
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x-y-1分之x²-2xy+y²-1化简x-y-1分之x²-2xy+y²-1化简x-y-1分之x²-2xy+y²-1化简（x²-2
x-y-1分之x²-2xy+y²-1 化简
x-y-1分之x²-2xy+y²-1 化简
x-y-1分之x²-2xy+y²-1 化简
（x²-2xy+y²-1)/(x-y-1)
=[(x-y)²-1]/(x-y-1)
=(x-y+1)(x-y-1)/(x-y-1)
=x-y+1
分子为：
x²-2xy+y²-1
=(x-y)²-1
=(x-y+1)(x-y-1)
所以原式=(x-y+1)(x-y-1)/(x-y-1)=x-y+1