$\frac{d}{dx}\left[\frac{\left(ln\:x\right)^3}{x^3}\right]$

$x^2-x+112=0$

$\lim_{x\to-1}\left(5x^4+10x^3+x\right)$

$15xy2\:+\:25xy$

$\left(-\frac{2}{5}+\left(\frac{\left(\frac{1}{4}-x\right)}{\left(\frac{1}{5}-x\right)}\right)\right)$

$\left(-27\right).\left(-3\right)^3.\left(-3\right)^4$

$-6+\left|-9\right|-\left|+3\right|$