$$( \frac{ 4 }{ 9 } \times \frac{ 9 }{ 5 } ) \times \frac{ 5 }{ 4 }$$
$1$
$$\frac{4\times 9}{9\times 5}\times \frac{5}{4}$$
$$\frac{4}{5}\times \frac{5}{4}$$
$$1$$
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