$$f\left(4\right)=4\left(4\right)\frac{-10}{x-2}$$

$$2\int e^{0,001x}dx$$

$$\sqrt{a^2b}.\:\sqrt[3]{a^2b^4}.\:\sqrt[5]{ab^4}$$

$$x^2+19x$$

$$121x^2-4y^8$$

$$\left(7y\cdot6n\right)\left(7f\cdot nx\right)$$