$$(\frac{81}{16})^{-\frac{1}{4}}\times(\frac{256}{625})^{-\frac{1}{2}}$$
$\frac{25}{24}\approx 1.041666667$
$$\frac{2}{3}\times \left(\frac{256}{625}\right)^{-\frac{1}{2}}$$
$$\frac{2}{3}\times \frac{25}{16}$$
$$\frac{25}{24}$$
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$\frac{5 ^ {2}}{2 ^ {3} \cdot 3} = 1\frac{1}{24} = 1.0416666666666667$
