$6-3\cdot\left|7-4\cdot\left(3-7\right)-\left(-2\right)\right|$

$\lim_{a\to\infty}1+\frac{1}{\sqrt{a^2+1}}$

$2x^3+3x^2-18x+8$

$\left(2v^{-\frac{5}{4}}\right)^8$

$\lim_{x\to n}\left(\frac{ln\left(n+2\right)}{\left(n^{\frac{1}{2}}\right)}\right)$

$4x^2+24+18$

$7-\left(-9\right)$