$$450 m | 51$$
$22950m$
$$450m\times 51$$
$$22950m$$
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$22950$
$$\frac{\mathrm{d}}{\mathrm{d}m}(450m\times 51)$$
$$\frac{\mathrm{d}}{\mathrm{d}m}(22950m)$$
$$22950m^{1-1}$$
$$22950m^{0}$$
$$22950\times 1$$
$$22950$$