$\int\:\frac{2-\sqrt{x}}{\sqrt{x}}dx$

$\int\left(x^2+2x\right)e^{2x}dx$

$\frac{x^2+5x-6}{x-3}$

$2m+n-\left\{-2m+3n\right\}-2n$

$\frac{2\sqrt{x}}{\sqrt{5}}$

$-15-3.9$

$\int_e^{+\infty}\frac{1}{x\left(\ln\left(x\right)\right)^2}dx$