$\sqrt{\frac{2.1}{1.8}}$

$-7\left(-4\right)-5\left(-3\right)$

$\lim_{n\to\infty}\left(e^n+2\right)^{\frac{2}{n}}$

$\int\left(\frac{\ln\left(5x\right)^3}{x}\right)dx$

$a\left(3+m\right)-3\left(3+m\right)$

$\lim_{x\to0}\frac{3x^2}{e^x-1-x}$