x2-2xy+y2-1/x-y-1
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x2-2xy+y2-1/x-y-1x2-2xy+y2-1/x-y-1x2-2xy+y2-1/x-y-1x2-2xy+y2-1/x-y-1=【(x-y)²-1】/(x-y-1)=(x-y-1)
x2-2xy+y2-1/x-y-1
x2-2xy+y2-1/x-y-1
x2-2xy+y2-1/x-y-1
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
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