$\left(3n^{-2}\right)^4$

$15x+2=47$

$\lim_{x\to3}\left(\frac{\sqrt{x+3}-\sqrt{6}}{x-3}\right)$

$36x^2-1=0$

$-2.\left(-3\right)+\left(-1\right)-\left(5+6\right)-14:\left(-7\right)$

$\left(2p^3\right)\left(5p^{-5}\right)$

$\frac{d^2}{dx^2}\left(-\frac{1}{2}x^4-\frac{4}{5}x^5+\frac{1}{3}\right)$