$$(8^{\frac{1}{5}})^{4}$$
$4\times 2^{\frac{2}{5}}\approx 5.278031643$
$$\left(\sqrt[5]{8}\right)^{4}$$
$$8^{\frac{1}{5}\times 4}$$
$$8^{\frac{4}{5}}$$
$$4\times 2^{\frac{2}{5}}$$
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