$\left(9.7\:times\:10^4\right)-\left(5.3\:times\:10^4\right)$

$_{\:\frac{2x-1}{x-1}when\:\:x\to1}$

$3x^2-2x-6=9$

$\frac{1}{\left(s^2+w^2\right)\:\left(l\:c\:s^2+r\:c\:s+1\right)}$

$11-15\:-5-3\:\:18\:-8\:\:0$

$\frac{d}{dx}\left(2x+3x^2y^2\right)$

$\left(9x\right)^{\frac{1}{2}}\:.\:\left(4x^{\frac{1}{4}}\right)$