$36m^4\:entre\:\frac{4}{9}m^5$

$12-9\cdot5+10$

$\left(x+y\right)\left(x-y\right)\left(x^2y^2\right)+y^8$

$200x^2-1250$

$\left[7-\left(5-13\right)\right]+\left[5-\left(29-19\right)-\left[-5-\left(-7\right)\right]\right]$

$\frac{1m}{2}+\frac{2x}{3}-\frac{5}{4}x-2m$

$\tan^2\:x\:+\:3\:=\:2\:\sec^2\:x$