$calcular16+\left(-5\right)-\left(-56\right)+\left(-17\right)-\left(+4\right)$

$\left(25m\right)^{\frac{2}{4}}$

$-\:40\:-\:5$

$24-\left(-75\right)$

$\log_a\left(x\right)=3$

$\int_{\frac{\pi}{2}}^{\infty}\frac{\sin\left(x\right)}{x^2}dx$

$\lim_{x\to0}\frac{-1}{\sqrt{x}}$