$$\left(5mn\right)\left(2mn\right)\left(7m-3n\right)$$

$$\int\frac{1}{x}-\frac{1}{x^2}+\frac{4}{x^{\frac{2}{3}}}dx$$

$$\left(2+x\right)-\left(x+2\right)^2+x\left(x-1\right)$$

$$\left(2a+1\right)^2-\left(a+2\right)^2$$

$$4x^2\:-\:8x\:+\:4$$

$$30-28.068$$

$$6cmcg$$