$\left(\frac{1}{5}xyz^3-\frac{2}{7}\right)\left(\frac{2}{7}+\frac{1}{5}xyz^3\right)$

$13\:-\:5\:+\:\:8\:-\:3\:.\:2\:+\:\left[\:14\:-\:\left(2\:+\:3\right)\:\right]\:$

$\left(+6\right)\::\:\left[\left(+5\right)\:-\:\left(+7\right)\right]$

$\left(3p^2-6q^3\right)^2$

$\frac{d}{dx}x\sqrt[3]{x}$

$8u^6-27v^9$

$8x^2-4x^3+6n^2-3xn^2$