Вычислите: 3. $$\sqrt[4]{7\frac{58}{81}}$$;

3. $$\sqrt[4]{7\frac{58}{81}} = \sqrt[4]{\frac{7*81+58}{81}} = \sqrt[4]{\frac{567+58}{81}} = \sqrt[4]{\frac{625}{81}} = \sqrt[4]{\frac{5^4}{3^4}} = \frac{5}{3} = 1\frac{2}{3}$$

Ответ: $$1\frac{2}{3}$$