化简 （x^2-2xy+y^2-1）/（x-y-1）
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化简（x^2-2xy+y^2-1）/（x-y-1）化简（x^2-2xy+y^2-1）/（x-y-1）化简（x^2-2xy+y^2-1）/（x-y-1）x^2-2xy+y^2-1=(x-y)^2-1^2
化简 （x^2-2xy+y^2-1）/（x-y-1）
化简 （x^2-2xy+y^2-1）/（x-y-1）
化简 （x^2-2xy+y^2-1）/（x-y-1）
x^2-2xy+y^2-1
=(x-y)^2-1^2
=(x-y+1)(x-y-1)
所以原式=(x-y+1)(x-y-1)/（x-y-1）＝x-y+1
X-y+1
x-y+1
（x^2-2xy+y^2-1）/（x-y-1）
=((x-y)^2-1)/(x-y-1） =(x-y-1)(x-y+1)/（x-y-1） =x-y+1
（x^2-2xy+y^2-1）/（x-y-1）
=[(x-y)^2-1]/（x-y-1）
=(x-y+1)(x-y-1)/（x-y-1）
=(x-y+1)
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