化简：（x-y)²-1/x-y-1 =.
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化简：（x-y)²-1/x-y-1=.化简：（x-y)²-1/x-y-1=.化简：（x-y)²-1/x-y-1=.(x-y-1)(x-y+1)/(x-y-1)=x-y+1
化简：（x-y)²-1/x-y-1 =.
化简：（x-y)²-1/x-y-1 =.
化简：（x-y)²-1/x-y-1 =.
(x-y-1)(x-y+1)/(x-y-1)=x-y+1
平方差公式啊
a^2-b^2=(a+b)(a-b)
(x-y)^2看成a 1看成b
x-y+1
原式=[(x-y)²-1²]/(x-y-1)
=(x-y+1)(x-y-1)/(x-y-1)
=x-y+1
平方差公式：a²-b²=(a+b)(a-b)
即(x-y)²-1²=(x-y+1)(x-y-1)