$5x^2+15x^3-10x$
$2\sqrt{x}\cdot x$
$7,09\cdot18,32$
$cos\:36=\frac{x}{10}$
$\lim_{x\to3}\left(\frac{x^2-4x+3}{x^2-7x+12}\right)$
$u^2+2u-6=0$
$-2x^3+\frac{3}{4}\left(-4x+2\right)+6x\left(\frac{1}{6}x-1\right)$
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