2xy/(x+y)^与x/x^-y^
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2xy/(x+y)^与x/x^-y^2xy/(x+y)^与x/x^-y^2xy/(x+y)^与x/x^-y^2xy(x-y)/(x+y)^(x-y)与x(x+y)/(x^-y^)(x+y)（话说那个小
2xy/(x+y)^与x/x^-y^
2xy/(x+y)^与x/x^-y^
2xy/(x+y)^与x/x^-y^
2xy(x-y)/(x+y)^(x-y)与x(x+y)/(x^-y^)(x+y)
（话说那个小三角是平方吧？？）
2xy*(x-y)/(x+y)＾*（x-y) x*(x+y)/（x＾-y＾）*（x+y）
【分母就都变成了(x+y)*(x+y)*(x-y)】
操，这也不会，快去睡觉吧
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