化简:[√(x/y)-√(y/x)]÷[(1/√y)-(1/√x)]
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化简:(x+y)÷(√x-√y)-2xy÷(x√y-y√x)答得好有赏!
化简:[√(x/y)-√(y/x)]÷[(1/√y)-(1/√x)]
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