$$28.76 m m m$$
$\frac{719m^{3}}{25}$
$$28.76m^{2}m$$
$$28.76m^{3}$$
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$\frac{2157m^{2}}{25}$
$$\frac{\mathrm{d}}{\mathrm{d}m}(28.76m^{2}m)$$
$$\frac{\mathrm{d}}{\mathrm{d}m}(28.76m^{3})$$
$$3\times 28.76m^{3-1}$$
$$86.28m^{3-1}$$
$$86.28m^{2}$$
