Задание 1, 2) (7/15 + 19/30) * 9/11

\( \frac{7}{15} + \frac{19}{30} = \frac{14}{30} + \frac{19}{30} = \frac{33}{30} = \frac{11}{10} \). \( \frac{11}{10} \cdot \frac{9}{11} = \frac{99}{110} = \frac{9}{10} \).