$$391\div425\div521$$
$\frac{23}{13025}\approx 0.001765835$
$$\frac{391}{425\times 521}$$
$$\frac{391}{221425}$$
$$\frac{23}{13025}$$
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$\frac{23}{5 ^ {2} \cdot 521} = 0.0017658349328214971$