(2/x+y)-(2/x-y) 化简
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(2/x+y)-(2/x-y)化简(2/x+y)-(2/x-y)化简(2/x+y)-(2/x-y)化简(2/x+y)-(2/x-y)=（2x-2y)/(x^2-y^2)-(2x+2y)/(x^2-y^
(2/x+y)-(2/x-y) 化简
(2/x+y)-(2/x-y) 化简
(2/x+y)-(2/x-y) 化简
(2/x+y)-(2/x-y)
=（2x-2y)/(x^2-y^2)-(2x+2y)/(x^2-y^2)
=-4y/(x^2-y^2)