г. 15 4 25 V9 121

г. $$ \sqrt{5 \frac{4}{9} \cdot \frac{25}{121}} = \sqrt{\frac{49}{9} \cdot \frac{25}{121}} = \sqrt{\frac{49}{9}} \cdot \sqrt{\frac{25}{121}} = \frac{7}{3} \cdot \frac{5}{11} = \frac{35}{33} = 1 \frac{2}{33} $$

Ответ: $$1 \frac{2}{33}$$