$9x^2+18x+8$
$\left(-3\right)\cdot81$
$\frac{d}{dx}lny=xe^y-2x$
$\frac{x^2-7x+2}{x-5}$
$2x+1\le0$
$\frac{dp}{dt}=0,02p+e^{0.1t}$
$x^2=77$
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