$$\frac{ \frac{ 4 }{ 13 } + \frac{ 5 }{ 15 } }{ }$$
$\frac{25}{39}\approx 0.641025641$
$$\frac{\frac{4}{13}+\frac{1}{3}}{1}$$
$$\frac{\frac{12}{39}+\frac{13}{39}}{1}$$
$$\frac{\frac{12+13}{39}}{1}$$
$$\frac{\frac{25}{39}}{1}$$
$$\frac{25}{39}$$
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$\frac{5 ^ {2}}{3 \cdot 13} = 0.6410256410256411$
