$\lim_{x\to\sqrt{5}}\left(\frac{x-\:\sqrt{5}}{x^2-5}\right)$

$\left(3x^2y^3-4z^4\right)^3$

$\frac{2}{3}+\frac{5}{6}+0.5$

$\int\frac{x^3}{\left(16+x^2\right)^3}dx$

$\left(1+3x^2\right)\left(1-3x^2\right)^{\frac{1}{2}}$

$58.2+62.8$

$32-\left(-14+7-4\right)-\left(+4\right)$