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2/a^2-1 +1/a+1 分式的加减
人气:208 ℃ 时间:2020-05-23 05:33:12
解答
=2/(a-1)(a+1) +(a-1)/(a+1)(a-1)
=(2+a-1)/(a-1)(a+1)
=(a+1)/(a-1)(a+1)
=1/(a-1)
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