$$3000 \times \frac { 675 } { 10000 } m ^ { 2 }$$
$\frac{405m^{2}}{2}$
$$3000\times \frac{27}{400}m^{2}$$
$$\frac{405}{2}m^{2}$$
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$405m$
$$\frac{\mathrm{d}}{\mathrm{d}m}(3000\times \frac{27}{400}m^{2})$$
$$\frac{\mathrm{d}}{\mathrm{d}m}(\frac{405}{2}m^{2})$$
$$2\times \frac{405}{2}m^{2-1}$$
$$405m^{2-1}$$
$$405m^{1}$$
$$405m$$
