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2/(a²-1)-1/(a²+a) 分式的加减
人气:273 ℃ 时间:2020-05-26 01:03:49
解答
原式=2/(a+1)(a-1)-1/a(a+1)
=2a/a(a+1)(a-1)-(a-1)/a(a+1)(a-1)
=(2a-a+1)/a(a+1)(a-1)
=1/a(a-1)
=1/a²-a
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