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1/(x-1) -2/(x平方-1) 化简
人气:428 ℃ 时间:2020-04-10 15:29:42
解答
1/(x-1) -2/(x平方-1)
=1/(x-1)-2/(x+1)(x-1)
=(x+1)/(x+1)(x-1)-2/(x+1)(x-1)
=(x-1)/(x+1)(x-1)
=1/(x+1)
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