Ответ:
\(\frac{7}{15}+\frac{19}{30}=\frac{14}{30}+\frac{19}{30}=\frac{33}{30}=\frac{11}{10}\).
\(\frac{11}{10}\cdot\frac{9}{11}=\frac{9}{10}\).
Ответ: \(\frac{9}{10}\).
\(\frac{7}{15}+\frac{19}{30}=\frac{14}{30}+\frac{19}{30}=\frac{33}{30}=\frac{11}{10}\).
\(\frac{11}{10}\cdot\frac{9}{11}=\frac{9}{10}\).
Ответ: \(\frac{9}{10}\).