$\lim_{x\to\infty}\left(\frac{x-1}{e^x}\right)$

$3x^2-2y\frac{dy}{dx}=0$

$\frac{dy}{dx}+\frac{2y}{125+3x}=0,5$

$2ydx\:+\:x\left(lnx-lny-1\right)dy=0\:\:\:\:\:\:\:\:\:\:\:\:\:\:$

$3^{2}\cdot2^{2}\cdot7^{2}$

$f\left(x\right)=\frac{3x^2+2}{\left(x^3+2x\right)\cdot\log\left(x^3+2x\right)}$

$3-2+5-7-4+7-2$