tim gioi han

M

mika_tmc

[TEX]lim (\sqrt{n^2+n} - (n^2 +2))[/TEX]
[TEX]lim (n^2 (\sqrt{\frac{1}{n^2}+ \frac{1}{n^3}} - 1 + \frac{2}{n^2}) = - \propto[/TEX]
vì lim [TEX]n^2 = + \propto[/TEX], lim (...)=-1,(...)<0
 
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