2) (7 19) 9 (15+30/11

2) $$(\frac{7}{15} + \frac{19}{30}) \cdot \frac{9}{11} = (\frac{7 \cdot 2}{15 \cdot 2} + \frac{19}{30}) \cdot \frac{9}{11} = (\frac{14}{30} + \frac{19}{30}) \cdot \frac{9}{11} = \frac{33}{30} \cdot \frac{9}{11} = \frac{3 \cdot 11}{10 \cdot 3} \cdot \frac{9}{11} = \frac{9}{10} = 0,9$$

Ответ: 0,9