$$3 \sqrt{ \frac{ 9 }{ 25 } }$$
$\frac{9}{5}=1.8$
$$3\times \frac{3}{5}$$
$$\frac{3\times 3}{5}$$
$$\frac{9}{5}$$
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$\frac{3 ^ {2}}{5} = 1\frac{4}{5} = 1.8$