Вычислите: 1)+루 4)醬一 7) 醬一

Вычислите:

1) \[\frac{5}{6} + \frac{2}{7} = \frac{5 \cdot 7 + 2 \cdot 6}{6 \cdot 7} = \frac{35 + 12}{42} = \frac{47}{42}\] 4) \[\frac{3}{20} + \frac{7}{15} = \frac{3 \cdot 3 + 7 \cdot 4}{60} = \frac{9 + 28}{60} = \frac{37}{60}\] 7) \[\frac{16}{35} - \frac{5}{14} = \frac{16 \cdot 2 - 5 \cdot 5}{70} = \frac{32 - 25}{70} = \frac{7}{70} = \frac{1}{10}\]