$\lim_{x\to\infty}\left(\frac{x-x^2}{1-x^2}\right)$
$4a^2+4a+a^2$
$0,22a^2b-1,09ab^2+5,15a^2b-0,09ab^2$
$xy'=2y+x^3e^x$
$\left(\:5\:+\:x\:\right)^2$
$2\left(3-2r\right)-4\left(2-r\right)$
$-8.2-5$
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