$$\frac{ 1 }{ \frac{ 1 }{ 36 } - \frac{ 1 }{ 45 } }$$
$180$
$$\frac{1}{\frac{5}{180}-\frac{4}{180}}$$
$$\frac{1}{\frac{5-4}{180}}$$
$$\frac{1}{\frac{1}{180}}$$
$$1\times 180$$
$$180$$
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$2^{2}\times 3^{2}\times 5$
