$\frac{1}{2}\left(400\right)\left(45\right)^2$
$\left(x+5y\right)^{2}$
$\frac{144m^2-36n^2}{12m-6n}$
$5+4-6-9+19-18+15$
$3b^{2}+3b+3+b-2b-2$
$\left(-82\right)\cdot\left(-42\right)$
$3^3-3$
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