$20^{-10}\cdot20^{11}$
$-4x+6;\:x=-5$
$\sqrt{2}+3\cdot\sqrt{2}$
$\left(a-b\right)\left(a^2+ab+b^2\right)\left(x^2+y^2+z^2\right)$
$\lim_{x\to3.9}\left(\frac{x^2-16}{x+4}\right)$
$5.608+56.08$
$\left(x^2\right)\cdot\left(x+3\right)\cdot\left(-8\right)$
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