$\left(2a+b+3c\right)^2$
$4\cdot3-1-2$
$\left(2u+v\right)\cdot\:\left(\frac{1}{3}u-v\right)$
$\left(7+18^1\right)$
$9\cdot22$
$\frac{a}{2}.\frac{b}{5}$
$12^9\cdot12^{-7}$
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