Вычислите:

1. a) $$\sqrt{\frac{49}{81}} = \frac{\sqrt{49}}{\sqrt{81}} = \frac{7}{9}$$
2. б) $$\sqrt{\frac{64}{100}} = \frac{\sqrt{64}}{\sqrt{100}} = \frac{8}{10} = \frac{4}{5}$$
3. в) $$\sqrt{1\frac{7}{9}} = \sqrt{\frac{16}{9}} = \frac{\sqrt{16}}{\sqrt{9}} = \frac{4}{3} = 1\frac{1}{3}$$
4. г) $$\sqrt{2\frac{1}{4}} = \sqrt{\frac{9}{4}} = \frac{\sqrt{9}}{\sqrt{4}} = \frac{3}{2} = 1\frac{1}{2}$$
5. д) $$\sqrt{\frac{16}{84}}$$ = $$\sqrt{\frac{4}{21}} = \frac{\sqrt{4}}{\sqrt{21}} = \frac{2}{\sqrt{21}} = \frac{2\sqrt{21}}{21}$$