$\left(-1\right)\left(-1\right)\left(11\right)$
$18-\left(-18-27\right)$
$\frac{27m^3-125n^3}{m-n}$
$\frac{dy}{dx}=\left(\frac{2}{x}-\frac{1}{x^2}\right)^{\frac{1}{2}}$
$-1^4$
$x2+xy-12\:cuando\:x=3\:e\:y=\:-1$
$\frac{x^2+x}{1-2x}$
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