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lim(1-x)/(x2-1) x趋向于1
人气:212 ℃ 时间:2020-06-08 16:09:41
解答
lim(1-x)/(x2-1)
=lim(1-x)/[(x-1)(x+1)]
因为x≠1,所以约分
=lim-1/(x+1)
x趋向于1

=lim-1/(1+1)
=-1/2
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