$2x\:+\:x\:-\:5x$

$\int\left(\frac{5x^2}{\left(x+2\right)^3}\right)dx$

$\int\frac{2x}{\left(1+x^2\right)^2\left(x+1\right)}dx$

$\left(a^2-2ay+y^2\right)\left(a+y\right)$

$\left(2\right)\left(3a+5b\right)^3$

$-2x+2+-2+5$

$\lim_{x\to\infty}\left(\frac{2t^2+3t}{t^2-5}\right)$