$x^2-6x+13$

$\left(-2^3\right).\left(-5x\right).\left(-3x^2\right)$

$\frac{2a^2-3b^{-3}}{2a^{-2}+b^{-3}}$

$\left(x-9m^3\right)\left(x+9m^3\right)$

$-12-3+18:\left(-12:6+8\right)$

$6x^4-17x^3+24x^2-34x+24\:\left(3x-4\right)$

$\int\left(x^6\left(x^7+17\right)^9\right)dx$