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计算极限Limx2-2x-3分之X2-9
人气:258 ℃ 时间:2020-04-04 20:21:06
解答
lim (x²-9)/(x²-2x-3) x趋近于3
=lim(x+3)(x-3)/(x+1)(x-3) x趋近于3
=lim(x+3)/(x+1) x趋近于3
=(3+3)/(3+1)
=3/2
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