$$\frac{ 0.005 \times 0.081 \times 3.2 }{ 0.09 \times 0.0025 \times 6.4 }$$
$0.9$
$$\frac{0.000405\times 3.2}{0.09\times 0.0025\times 6.4}$$
$$\frac{0.001296}{0.09\times 0.0025\times 6.4}$$
$$\frac{0.001296}{0.000225\times 6.4}$$
$$\frac{0.001296}{0.00144}$$
$$\frac{1296}{1440}$$
$$\frac{9}{10}$$
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$\frac{3 ^ {2}}{2 \cdot 5} = 0.9$
