$\left(x+11\right)\left(x-10\right)$

$2\left(-2\right)^3\left(-3\right)-3\left(-2\right)^2\left(3\right)+4\left(-3\right)-2$

$\frac{3}{x^3-8}=\frac{1}{x-2}$

$\lim\:_{x\to\:-5}\left(\frac{10x^2+50}{x^2-25}\right)$

$1\:-\:\left(\frac{13}{7}-\frac{120}{7b}\right)^2$

$1024\cdot512\cdot256$

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