$$\frac{ 18 \sqrt{ 9(4-2)+5 } }{ }$$
$18\sqrt{23}\approx 86.32496742$
$$\frac{18\sqrt{9\times 2+5}}{1}$$
$$\frac{18\sqrt{18+5}}{1}$$
$$\frac{18\sqrt{23}}{1}$$
$$18\sqrt{23}$$
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