$$(\frac{5}{8})^{4}\times(\frac{5}{8})^{-6}\times(\frac{5}{8})^{-2}$$
$\frac{4096}{625}=6.5536$
$$\left(\frac{5}{8}\right)^{-2}\times \left(\frac{5}{8}\right)^{-2}$$
$$\left(\frac{5}{8}\right)^{-4}$$
$$\frac{4096}{625}$$
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$\frac{2 ^ {12}}{5 ^ {4}} = 6\frac{346}{625} = 6.5536$
