$\frac{x+3y}{3xy}+\frac{x^2y}{x^2y^2}$
$\left|-2.5\right|$
$3x^2+2x+1\ge0$
$\left(\frac{3}{5}-\frac{3}{10}\right)^2\cdot\frac{10}{9}-\sqrt{0.5^2+0.6\cdot0.4}$
$\frac{x^2+x^{-2}}{x^3+x^{-3}}$
$4-x<x+10$
$\frac{y}{x}\left(10x+z\right)$
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