$ln\left(\frac{x}{x-2}\right)$
$-9\:+\:4q\:=\:-9q\:+\:4$
$98n^2-200$
$\lim_{x\to0}\left(1+\frac{4}{x}\right)^{3x}$
$\frac{1}{3}x^5-2x^4-\frac{2}{5}x-0,3x^5-1,6x+2x^4$
$-2\sqrt{20}+4\sqrt{20}-3\sqrt{20}$
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