$$13 \frac{ \sqrt{ 8 \div 0.125 } }{ 8.0125 }$$
$\frac{8320}{641}\approx 12.979719189$
$$13\times \frac{\sqrt{\frac{8000}{125}}}{8.0125}$$
$$13\times \frac{\sqrt{64}}{8.0125}$$
$$13\times \frac{8}{8.0125}$$
$$13\times \frac{80000}{80125}$$
$$13\times \frac{640}{641}$$
$$\frac{13\times 640}{641}$$
$$\frac{8320}{641}$$
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$\frac{5 \cdot 13 \cdot 2 ^ {7}}{641} = 12\frac{628}{641} = 12.97971918876755$
