$\frac{11ab^2}{2c}\cdot\frac{10x}{33ab}$
$\left(4b^3\right)\left(5b^5\right)$
$x^2+9\le0$
$\frac{3m^{-4}}{m^3}$
$e^{2x-y}\frac{dy}{dx}=e^{-x}$
$4y^2-56y+196$
$\left(8u^2-6v^2\right)+\left(4v^2-2u^2+6\right)$
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