$\lim_{x\to\infty}\left(\frac{e^{-x}}{\sqrt{x}}\right)$
$\frac{xy^5}{y^3}$
$\left(10st+s^2v^3\right)^3$
$2x+7x-6x+8$
$\left(5a^{x+1}-3b^{2+x}\right)\left(5a^{x+2}-3b^{x+2}\right)$
$\frac{\left(k^2-7k+10\right)}{\left(k-2\right)}$
$-15-\left(-4\right)$
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