$$m\cdot\frac{(m-1)}{2}:1\cdot\frac{(m-2)}{2}$$
$\frac{m\left(m-2\right)\left(m-1\right)}{4}$
$$\frac{\frac{m\left(m-1\right)}{2}}{1}\times \frac{m-2}{2}$$
$$\frac{m\left(m-1\right)}{2}\times \frac{m-2}{2}$$
$$\frac{m\left(m-1\right)\left(m-2\right)}{2\times 2}$$
$$\frac{m\left(m-1\right)\left(m-2\right)}{4}$$
$$\frac{\left(m^{2}-m\right)\left(m-2\right)}{4}$$
$$\frac{m^{3}-2m^{2}-m^{2}+2m}{4}$$
$$\frac{m^{3}-3m^{2}+2m}{4}$$
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$\frac{m^{3}}{4}-\frac{3m^{2}}{4}+\frac{m}{2}$
