$\frac{dy}{dx}+9e^yx=0$
$\frac{dy}{dx}=-2xy-y+4x-2$
$\lim_{x\to8}\left(\frac{x-4-\sqrt{x^2-48}}{x-8}\right)$
$3.8\cdot2.7$
$\frac{\left(-1+-1\right)}{1}-\left(-1\right)-2\left(-1\right)$
$16+40x^2$
$\frac{x^5-5x^3+4}{x+1}$
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