$$\frac{ 6 \sqrt{ 9 } }{ 9 \sqrt{ 1 } }$$
$2$
$$\frac{2\sqrt{9}}{3\sqrt{1}}$$
$$\frac{2\times 3}{3\sqrt{1}}$$
$$\frac{6}{3\sqrt{1}}$$
$$\frac{6}{3\times 1}$$
$$\frac{6}{3}$$
$$2$$
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