计算:y/(y²-x²)-1/(x-y)=_______
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计算:y/(y²-x²)-1/(x-y)=_______计算:y/(y²-x²)-1/(x-y)=_______计算:y/(y²-x²)-1
计算:y/(y²-x²)-1/(x-y)=_______
计算:y/(y²-x²)-1/(x-y)=_______
计算:y/(y²-x²)-1/(x-y)=_______
y/(y²-x²)-1/(x-y)
=y/(y-x)(y+x)+(y+x)/(y-x)(y+x)
=(2y+x)/(y-x)(y+x)
(2y+x)/(y²-x²)