$$( \frac { 4 } { 7 } ) ^ { 2 } \cdot ( \frac { 7 } { 4 } ) ^ { - 1 }$$
$\frac{64}{343}\approx 0.186588921$
$$\frac{16}{49}\times \left(\frac{7}{4}\right)^{-1}$$
$$\frac{16}{49}\times \frac{4}{7}$$
$$\frac{64}{343}$$
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$\frac{2 ^ {6}}{7 ^ {3}} = 0.18658892128279883$
