$$(\frac{2}{3})^{-3}\times(\frac{3}{7})^{2}$$
$\frac{243}{392}\approx 0.619897959$
$$\frac{27}{8}\times \left(\frac{3}{7}\right)^{2}$$
$$\frac{27}{8}\times \frac{9}{49}$$
$$\frac{243}{392}$$
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$\frac{3 ^ {5}}{2 ^ {3} \cdot 7 ^ {2}} = 0.6198979591836735$
