$6-\left(1+2\left(-3-1\right)-5\right)$

$\lim_{x\to\infty}\left(\frac{0.5^x}{\frac{1}{x}}\right)$

$\frac{2x-1}{x-3}<1$

$\frac{ydy}{xdx}=\left(1+x^2\right)^{\frac{-1}{2}}\left(1+y^2\right)^{\frac{1}{2}}$

$\sqrt[2]{a}+\sqrt[2]{b}+\sqrt[2]{c}=0$

$9,8+72,5+7,98$

$2\times\:\left(x+2\right)=16$