$$1 \sqrt{ 7 \sqrt{ \frac{ 6 }{ \frac{ 6 }{ } } } }$$
$\sqrt{7}\approx 2.645751311$
$$1\sqrt{7\sqrt{\frac{6}{6}}}$$
$$1\sqrt{7\sqrt{1}}$$
$$1\sqrt{7\times 1}$$
$$1\sqrt{7}$$
$$\sqrt{7}$$
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