lim(n→∞)(3n^3-2n+1)/n^3+n^2 快
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lim(n→∞)(3n^3-2n+1)/n^3+n^2 快
lim(n→∞)(3n^3-2n+1)/n^3+n^2
快
lim(n→∞)(3n^3-2n+1)/n^3+n^2 快
上下同除以n³
原式= lim(n→∞)(3-2/n²+1/n³)/(1+1/n)
=3/1
=3
因为对n不能求导故
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