$$\frac{ 39 }{ 69 } { 39 }^{ 2 }$$
$\frac{19773}{23}\approx 859.695652174$
$$\frac{13}{23}\times 39^{2}$$
$$\frac{13}{23}\times 1521$$
$$\frac{13\times 1521}{23}$$
$$\frac{19773}{23}$$
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$\frac{3 ^ {2} \cdot 13 ^ {3}}{23} = 859\frac{16}{23} = 859.695652173913$