$$(2/5)4 \times (2/5)5/(2/5)9$$
$72$
$$4\times \frac{2}{5}\times 5\times 9$$
$$\frac{4\times 2}{5}\times 5\times 9$$
$$\frac{8}{5}\times 5\times 9$$
$$8\times 9$$
$$72$$
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$2^{3}\times 3^{2}$
