$-25\:x\:-10$

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

$\frac{2}{4}+\frac{3}{4}+\frac{3}{4}$

$73+12\cdot\left(54-24\right)-7\cdot\left(25-26\right)\cdot\left(13-5\cdot3+3\right)-38$

$\frac{2^x}{2^x}=2^{-2x}$

$\lim_{x\to\infty}\left(\frac{x^3}{x^2-1}-\frac{x^3}{x^2+1}\right)$

$4b\:and\:3b\:+\:b$