$x^5-2x^2+x$
$-b^2=4b-20$
$u^3+w^3$
$\frac{x^2+2x-5}{x+1}$
$2,65+4,105$
$\lim_{x\to4}\left(\frac{x^2-2x}{x^2-4x+4}\right)$
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