$$6x^8y^3+2y^2-12y^5z$$

$$2a-\left|7a-\left(3a-7b\right)+\left(10a-9b\right)\right|$$

$$3\:+\:4d\:+\:2d$$

$$\frac{x^{18}-1}{x^2+1}$$

$$2^{11}\cdot2^{-7}$$

$$\int\frac{8x}{\left(x^2+3\right)\left(x-1\right)^2}dx$$

$$2^8\cdot3^4\cdot5^2$$