$\frac{a^2b^3}{-a^2b^3}$

$-\:4\:;\:b\:=\:5;\:c\:=\:10-8\:a\:+\:9\:b\:+\:5\:c$

$\lim_{x\to0}\left(\frac{x+1}{2\sqrt{x}}\right)$

$\int\left(-3\cdot x^2\cdot log\left(5\cdot x\right)\right)\cdot dx$

$\frac{4n^2-7n^2+n^2}{2n+1}$

$\left(29\right)\left(31\right)$

$\lim_{x\to0}\left(\frac{4^x-1}{1-2^x}\right)$