109. \( (-0,3 + \frac{7}{15}) \cdot \frac{5}{8} - (-\frac{1}{2}) : 0,25\)

Решение:

1. \( -0,3 + \frac{7}{15} = -\frac{3}{10} + \frac{7}{15} = -\frac{9}{30} + \frac{14}{30} = \frac{5}{30} = \frac{1}{6} \)
2. \( \frac{1}{6} \cdot \frac{5}{8} = \frac{5}{48} \)
3. \( 0,25 = \frac{1}{4} \)
4. \( -\frac{1}{2} : \frac{1}{4} = -\frac{1}{2} \cdot 4 = -2 \)
5. \( \frac{5}{48} - (-2) = \frac{5}{48} + 2 = \frac{5}{48} + \frac{96}{48} = \frac{101}{48} \)

Ответ: \(\frac{101}{48}\).