$\left(-12\right)\cdot4\left(-32\right):8-\left(-5\right)$
$\left(-45\right)\cdot0+20\cdot\left(-11\right)-9$
$18-\left(-18-27\right)$
$2x\left(5x-3\right)-\left(11-6x\right)$
$\left(r-8\right)\left(r-2\right)$
$\lim_{x\to\infty}\left(\sqrt{x+3}-\sqrt{x}\right)$
$\frac{\frac{1}{x}}{x}$
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