$6\:\cdot\:-9\:+\:5\:-18$
$111\cdot5$
$2\sqrt{-16}$
$\frac{-x^2}{x^2+1}$
$x^3-x^2+1-3$
$a^2+b^2=145$
$\frac{\left(5x\:10^{-3}\right)\left(6x\:10^6\right)}{15\:x\:10^{-6}}$
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