$81-m^2$
$\frac{4r^2}{7r^3}$
$\frac{-45+15}{45-15}$
$a^2-8a-16$
$4.5+3.5$
$2.\left(1-3\right)\cdot\left(2-1\right)$
$3\sqrt{\frac{x^3-2x^2+3}{2x+1}}$
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