$\left(5.62\cdot10^{-5}\right)\left(2.716\cdot10^3\right)$
$\frac{3x}{\sqrt{9x}}$
$x^2+2y^2-y=x^2$
$\:t^2+\:9t\:+\:81$
$x^2+4xy+4xy^2$
$x^2+7x-78$
$\lim_{n\to\infty}\left(\frac{5n\left(x-6\right)}{n+1}\right)$
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