化简:〔1-[2/(x+1)]〕÷[1/(x²-1)]
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化简:〔1-[2/(x+1)]〕÷[1/(x²-1)]
化简:〔1-[2/(x+1)]〕÷[1/(x²-1)]
化简:〔1-[2/(x+1)]〕÷[1/(x²-1)]
(1-2/x+1)÷1/x^2-1
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