$16\cdot64$
$3z\cdot1$
$\left(1200\right):\left(-100\right):\left(4\right):\left(-3\right)$
$\left(9m+6n\right)\left(9m-6n\right)$
$10b-10m^3+18m^2$
$4\left(2-3\right)$
$\frac{e^{-\frac{\pi}{2}s}}{s\left(s^2+s\right)}$
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