1) (\( \frac{3}{7} \) + \( \frac{5}{14} \)) · 14 = \( \frac{3}{7} \)·14 + \( \frac{5}{14} \)·14 = 3·2 + 5 = 6 + 5 = 11
2) (\( \frac{1}{8} \) + \( \frac{1}{6} \)) · 24 = \( \frac{1}{8} \)·24 + \( \frac{1}{6} \)·24 = 3 + 4 = 7
3) (\( \frac{4}{15} \) - \( \frac{1}{30} \)) · 30 = \( \frac{4}{15} \)·30 - \( \frac{1}{30} \)·30 = 4·2 - 1 = 8 - 1 = 7
Ответ: 1) 11; 2) 7; 3) 7