$\lim_{x\to9}\left(\frac{xe3-27}{x^2-9}\right)$

$3\left(1+2v\right)-3\left(1+4v\right)$

$16:-5$

$\left(\frac{\left(x\right)}{\left(1+x\right)}\right)^3\:about\:0$

$\lim_{x\to\infty}\left(\frac{ln\left(n\right)}{ln\left(2n\right)}\right)$

$\lim_{x\to\infty}\left(\frac{\left(\arctan\left(x\right)\right)}{\left(e^{-x}\right)}\right)$