$\frac{10^3}{10^1}$
$x^{2}-400y^{2}$
$x-\sqrt{x-1}=1$
$\left(z+2\right)^2-\left(z-2\right)^2$
$-\:9\:\left(\:-8\:\right)\left(-5\right)$
$-\frac{27}{1}$
$\frac{x^2+x-2}{x^3-x+3}$
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