$$7/278 \div 7/275 \div 7/278$$
$\frac{1}{148771700}\approx 6.721708497 \cdot 10^{-9}$
$$\frac{\frac{\frac{\frac{7}{278}}{7}}{275}}{7\times 278}$$
$$\frac{\frac{\frac{7}{278}}{7\times 275}}{7\times 278}$$
$$\frac{\frac{\frac{7}{278}}{1925}}{7\times 278}$$
$$\frac{\frac{7}{278\times 1925}}{7\times 278}$$
$$\frac{\frac{7}{535150}}{7\times 278}$$
$$\frac{\frac{1}{76450}}{7\times 278}$$
$$\frac{\frac{1}{76450}}{1946}$$
$$\frac{1}{76450\times 1946}$$
$$\frac{1}{148771700}$$
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$\frac{1}{2 ^ {2} \cdot 5 ^ {2} \cdot 7 \cdot 11 \cdot 139 ^ {2}} = 6.721708496978928 \times 10^{-9}$
