$-\frac{y}{x^2}dx+\frac{1}{x}dy=0$
$\frac{x}{x^4+6x^3+9x^2}$
$\frac{14.8}{2}$
$25m^2+20m$
$3x^2+x-9=5$
$4-\left(-2\right)\cdot7$
$\lim_{x\to+\infty}\left(\frac{4x^3+1}{2x^x+x}\right)$
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