$$\frac{ 7 { x }^{ 2 } }{ 160 \times 777777 }$$
$\frac{x^{2}}{17777760}$
$$\frac{x^{2}}{160\times 111111}$$
$$\frac{x^{2}}{17777760}$$
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$\frac{x}{8888880}$
$$\frac{\mathrm{d}}{\mathrm{d}x}(\frac{x^{2}}{160\times 111111})$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(\frac{x^{2}}{17777760})$$
$$2\times \frac{1}{17777760}x^{2-1}$$
$$\frac{1}{8888880}x^{2-1}$$
$$\frac{1}{8888880}x^{1}$$
$$\frac{1}{8888880}x$$
