$\frac{\sqrt{x^7y^5}}{x^4y^4}$
$-12y-11<49$
$\frac{-7}{5}\sqrt[3]{81a}-2\sqrt[3]{3a^4}+\frac{\sqrt[3]{3a}}{15}$
$\lim_{x\to-1}\frac{1}{2x+2}$
$\left(5\cdot5\right)+\left(51-20\right)$
$4\:-\:52\:-\:72\:+\:39$
$\left(8a-9\right)^2$
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