$\lim_{x\to0}\left(\frac{1+x+2x^3}{1-x-x^3}\right)$
$85.306-58.603$
$\left(x+1\right)\left(x-4\right)\le0$
$\left(3x+2\right)^2+2x\left(3x+4\right)$
$494\cdot580$
$\frac{-4\cdot0\cdot500}{100\cdot2}$
$4i^2-5i-2$
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