y/x(x+y),x/y(x-y)通分

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y/x(x+y),x/y(x-y)通分

y/x(x+y),x/y(x-y)通分
y/x(x+y),x/y(x-y)通分

y/x(x+y),x/y(x-y)通分
y^2(x-y)/xy(x+y)(x-y),x^2(x+y)/xy(x+y)(x-y)