$$\frac{ 14 }{ 25 } + \frac{ 16 }{ 63 }$$
$\frac{1282}{1575}\approx 0.813968254$
$$\frac{882}{1575}+\frac{400}{1575}$$
$$\frac{882+400}{1575}$$
$$\frac{1282}{1575}$$
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$\frac{2 \cdot 641}{3 ^ {2} \cdot 5 ^ {2} \cdot 7} = 0.813968253968254$