$\left(5-x^2\right)\left(25+5x^2+x^4\right)$
$-8x\:-3\:x\:-4\:$
$n^4-20n^2+64$
$\frac{1}{2}x\:+\:0,5y\:\cdot\frac{1}{2}x\:+\:0,5y$
$\lim_{x\to\infty}\left(\frac{6x^2-x+2}{3x^2-3x+1}\right)$
$-2x^2yz+2xy^2$
$\frac{x^3y^{-2}z}{x^0y^2z^4}$
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