$-x^3y^{-2}\left(2x^{-1}y^{-1}+2x^{-2}y\right)$
$15m+5m$
$\frac{3.8}{2}$
$-6x^2+3x+18$
$\frac{dy}{dx}+4y=\frac{4}{3}$
$-3,\:8m^2m^3\:por\:0,\:9m+3,\:7n-11,\:2$
$\int\frac{x+1}{x^3-x}dx$
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