化简3/(x²+2xy+y²)-4/(x²-2xy+y²)+5/(x²-y²)
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化简3/(x²+2xy+y²)-4/(x²-2xy+y²)+5/(x²-y²)
化简3/(x²+2xy+y²)-4/(x²-2xy+y²)+5/(x²-y²)
化简3/(x²+2xy+y²)-4/(x²-2xy+y²)+5/(x²-y²)