$\frac{28.3}{53.1}$
$49-14z-z^2$
$10^3\cdot10d^{15}$
$\frac{1}{x^2}+4x+4$
$1000-350$
$3x+\frac{2}{x}=7$
$\left(\frac{2}{5}u^3-\frac{1}{2}v\right)\left(\frac{2}{5}u^3+\frac{1}{2}v\right)$
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