16) $$\sqrt{\frac{49}{81}} + \sqrt{49} =$$

Решение:

$$\sqrt{\frac{49}{81}} + \sqrt{49} = \frac{\sqrt{49}}{\sqrt{81}} + 7 = \frac{7}{9} + 7 = \frac{7 + 7 \cdot 9}{9} = \frac{7 + 63}{9} = \frac{70}{9} = 7\frac{7}{9}$$

Ответ: $$7\frac{7}{9}$$