计算2x/x^2-y^2 3x/y^2-x^2 y/(x y)(y-x)快!
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计算2x/x^2-y^23x/y^2-x^2y/(xy)(y-x)快!计算2x/x^2-y^23x/y^2-x^2y/(xy)(y-x)快!计算2x/x^2-y^23x/y^2-x^2y/(xy)(y
计算2x/x^2-y^2 3x/y^2-x^2 y/(x y)(y-x)快!
计算2x/x^2-y^2 3x/y^2-x^2 y/(x y)(y-x)快!
计算2x/x^2-y^2 3x/y^2-x^2 y/(x y)(y-x)快!
2x/(x^2-y^2)+3x/(y^2-x^2)+ y/(x+y)(y-x)
=2x/(x+y)(x-y)-3x/(x+y)(x-y)-y/(x+y)(x-y)
=(2x-3x-y)/(x+y)(x-y)
=-(x+y)/(x+y)(x-y)
=1/(y-x)
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