分式的通分:2xy/(x+y)^2与x/(x^2+y^2)分式通分,

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分式的通分:2xy/(x+y)^2与x/(x^2+y^2)分式通分,

2xy/(x+y)²=2xy(x²+y²)/[(x+y)²(x²+y²)]
x/(x²+y²)=x(x+y)²/[(x+y)²(x²+y²)]