化简x-y/2xy-x²-y²
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化简x-y/2xy-x²-y²化简x-y/2xy-x²-y²化简x-y/2xy-x²-y²(x-y)/(2xy-x²-y²
化简x-y/2xy-x²-y²
化简x-y/2xy-x²-y²
化简x-y/2xy-x²-y²
(x-y)/(2xy-x²-y²)
=(x-y)/-(x-y)²
=1/-(x-y)
=1/(y-x)
-（x-y)/（x-y）^2=-1/(x-y)=1/(y-x)