$a^3\left(\frac{1}{8}a^2\right)$

$\lim_{x\to3}\left(\frac{x^2-9}{x^2+5x-6}\right)$

$\frac{1}{\left(1-x\right)^1}$

$\left(x-15.6\right)^2$

$\frac{1-\sqrt{3-\left(x+y\right)}-\left(1-\sqrt{3-x}\right)}{y}$

$-\frac{5}{2}\cdot x+\frac{2}{3}\le-\frac{11}{6}$

$\lim_{x\to\infty}\left(\frac{27x^9+12}{9x^9+x^4}\right)$