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lim(1/(x-1)-2/(x平方-1) x趋近于1
人气:284 ℃ 时间:2020-04-20 07:58:20
解答
lim(x->1)[1/(x-1)-2/(x^2-1) ]
=lim(x->1)(x-1)/(x^2-1)
=lim(x->1)1/(x+1)
=1/2
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