2) \(\sqrt{3\frac{6}{25}}=\)

\(3\frac{6}{25}=\frac{81}{25}\).

\(\sqrt{3\frac{6}{25}}=\sqrt{\frac{81}{25}}=\frac{9}{5}=1\frac{4}{5}\).

Ответ: \(1\frac{4}{5}\)