$0,1\frac{di}{dt}+50i=30$

$\frac{\left(x^2+6x-2\right)}{x-3}$

$-\left(-1^2\right)+2\left(1\right)+3$

$\lim_{x\to\infty}\left(\frac{\ln\left(1+e^{3x}\right)}{\ln\left(1+e^x\right)}\right)$

$\frac{4x-3}{2x-5}>1$

$\int\frac{x^2}{\left(x^2+16\right)^2}dx$

$-215-478$