$498\:+\:223\:$
$3a\left(a+2\right)\left(a-2\right)$
$\lim_{x\to+\infty}\left(1-\frac{1}{x^2}\right)^x$
$20:\left(6-8\right)-\left(4-2\right)+6.5:3$
$\left(x\:+\:54\right)\left(x\:-35\right)$
$\left(y^2-10y\right)\left(y^2+10\right)$
$m^2n^3-2n$
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