з) \(\sqrt{5\frac{1}{16}}\) ;

з) \(\sqrt{5\frac{1}{16}} = \sqrt{\frac{5 \cdot 16 + 1}{16}} = \sqrt{\frac{80 + 1}{16}} = \sqrt{\frac{81}{16}} = \frac{\sqrt{81}}{\sqrt{16}} = \frac{9}{4} = 2\frac{1}{4}\)

Ответ: \(2\frac{1}{4}\)