$\frac{5x^2-2x^2-3}{x-1}$

$\left(b-\frac{1}{2}\right)\left(b-\frac{1}{3}\right)$

$\left(x\:+9\right)^2$

$\frac{d}{dx}1$

$3\sqrt[3]{8x^6}y^4z^7-5x^2\sqrt[3]{y^4}z^7$

$\sqrt[3]{\frac{a^5bc^8}{ac^2}}\cdot\sqrt[3]{\frac{a^4b^2c}{a^2c}}$

$\frac{dy}{dx}=0,4-\frac{2y}{25}$