$\sqrt{\frac{8a^2}{9bc}}$
$-9\left(-10\right).20-\left(-1\right)$
$\sqrt{2}\sqrt{4}$
$x^2+2x-8<0$
$\left(-3x+2\right)\left(2x-1\right)$
$\left(\frac{3m^{-1}n^4}{5n^{-4}m^{-3}}\right)^{-2}$
$12,85\:-4,6$
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