$$22\times10^{-6}m^{2}$$
$\frac{11m^{2}}{500000}$
$$22\times \frac{1}{1000000}m^{2}$$
$$\frac{11}{500000}m^{2}$$
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$\frac{11m}{250000}$
$$\frac{\mathrm{d}}{\mathrm{d}m}(22\times \frac{1}{1000000}m^{2})$$
$$\frac{\mathrm{d}}{\mathrm{d}m}(\frac{11}{500000}m^{2})$$
$$2\times \frac{11}{500000}m^{2-1}$$
$$\frac{11}{250000}m^{2-1}$$
$$\frac{11}{250000}m^{1}$$
$$\frac{11}{250000}m$$