$\left(-30\right)+25\:x\:6$

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

$\:2a\:+\:ab$

$\lim_{x\to0}\left(\frac{9^x-8^x}{3^x-2^x}\right)$

$\int\left(1+x-3x^2\right)\cdot e^xdx$

$1.20\cdot2.25$

$\left(8x^3y^{-3}\right)^{\frac{-2}{3}}\left(x^{-8}y^{-4}\right)^{\frac{3}{4}}$