$$\frac{ 300 }{ 4 } \times \frac{ 250 }{ x }$$
$\frac{18750}{x}$
$$75\times \frac{250}{x}$$
$$\frac{75\times 250}{x}$$
$$\frac{18750}{x}$$
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$-\frac{18750}{x^{2}}$
$$\frac{\mathrm{d}}{\mathrm{d}x}(75\times \frac{250}{x})$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(\frac{75\times 250}{x})$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(\frac{18750}{x})$$
$$-18750x^{-1-1}$$
$$-18750x^{-2}$$
