$$\frac { - 512 } { 441 } \frac { - 1024 } { 21 }$$
$\frac{524288}{9261}\approx 56.612460857$
$$-\frac{512}{441}\times \frac{-1024}{21}$$
$$-\frac{512}{441}\left(-\frac{1024}{21}\right)$$
$$\frac{-512\left(-1024\right)}{441\times 21}$$
$$\frac{524288}{9261}$$
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$\frac{2 ^ {19}}{3 ^ {3} \cdot 7 ^ {3}} = 56\frac{5672}{9261} = 56.61246085735882$
