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求极限lim(x→3)x^2-4x+3/x^2-9
人气:326 ℃ 时间:2020-02-02 20:15:25
解答
lim(x^2-4x+3)/(x^2-9)
=lim(x-1)(x-3)/[(x-3)(x+3)]
=lim(x-1)/(x+3)
=lim(3-1)/(3+3)
=1/3
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