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(a-1/a)÷(a²+2a+1)/(a+1)
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人气:190 ℃ 时间:2020-05-27 10:53:49
解答

(a-1/a)÷(a²+2a+1)/(a+1)
=(a²-1)/a÷(a+1)²/(a+1)
=(a+1)(a-1)/a÷(a+1)
=(a-1)/a
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