$$\frac{12m^{2}n^{2}p^{2}}{24mnp}$$
$\frac{np}{2}$
$$\frac{\mathrm{d}}{\mathrm{d}m}(\frac{12n^{2}p^{2}}{24np}m^{2-1})$$
$$\frac{\mathrm{d}}{\mathrm{d}m}(\frac{np}{2}m^{1})$$
$$\frac{np}{2}m^{1-1}$$
$$\frac{np}{2}m^{0}$$
$$\frac{np}{2}\times 1$$
$$\frac{np}{2}$$
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$\frac{mnp}{2}$
$$\frac{mnp}{2}$$
