原式=lim{-[(x+3)(x-3)]/[(x-1)(x-3)] x→3
=lim{-(x+3)/(x-1)} x→3
=-(3+3)/(3-1)
=-3
如何算极限lim{(9-x^2)/(x^2-4x+3)},
如何算极限lim{(9-x^2)/(x^2-4x+3)},
数学人气:458 ℃时间:2020-02-03 06:04:11
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