$$5k\times4k\div2$$
$10k^{2}$
$$\frac{5k^{2}\times 4}{2}$$
$$\frac{20k^{2}}{2}$$
$$10k^{2}$$
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$20k$
$$\frac{\mathrm{d}}{\mathrm{d}k}(\frac{5k^{2}\times 4}{2})$$
$$\frac{\mathrm{d}}{\mathrm{d}k}(\frac{20k^{2}}{2})$$
$$\frac{\mathrm{d}}{\mathrm{d}k}(10k^{2})$$
$$2\times 10k^{2-1}$$
$$20k^{2-1}$$
$$20k^{1}$$
$$20k$$
