$1+\left(\frac{\frac{1}{3}\left(5\right)}{3}\right)\left(\frac{11}{4}\right)-0.7$

$5\left[3x+2\right]-2\left[4x-1\right]$

$\frac{x^2}{9}-\frac{2xy}{3}+y^2$

$\lim_{x\to\infty}\left(\frac{x-4}{x^2+4x+3}\right)$

$\lim_{x\to7}\left(\frac{\left|x-7\right|}{x^2-8x+7}\right)$

$\left(m+n+z\right)\left(m-n-z\right)$

$\frac{d}{dx}2x^2-xy+y^2=4$