$12\:+\:10\:\cdot\:-1\:\cdot\:3$

$\int_2^{-1}\left(3x^2+5\right)dx$

$\frac{dy}{dx}\left(y\:=\:x\sqrt{x^2+12}\right)$

$-4^2+-5^2-2$

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

$\left(+8.160\right)\:-\:\left(+9.149\right)\:$

$\left(-0.3x^2+\frac{1}{3}y\:+\frac{5}{4}y^2\right)+\left(-\frac{1}{5}x^2\:+\frac{1}{2}y\:+\frac{7}{8}xy\right)$