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

$-13-12-\left(-11\right)$

$\left(\frac{-2y^2}{3}\right)^3$

$3=-23+g$

$5x+x+7\left(2x\right)$

$\lim_{x\to0}\left(\frac{x}{\frac{1}{2+x}-\frac{1}{2}}\right)$

$\sqrt{\left[\left(1.8-3.1\right)^2+\left(3.9-4.9\right)^2\right]}$