1) Выполните действия

Решения:
a) \( \frac{11}{17} + \frac{3}{17} = \frac{11+3}{17} = \frac{14}{17} \).
b) \( \frac{39}{100} - \frac{12}{100} = \frac{39-12}{100} = \frac{27}{100} \).
c) \( \frac{7}{15} \cdot \frac{3}{5} = \frac{7 \cdot 3}{15 \cdot 5} = \frac{21}{75} = \frac{7}{25} \).
d) \( \frac{5}{7} \div \frac{2}{7} = \frac{5}{7} \cdot \frac{7}{2} = \frac{35}{14} = \frac{5}{2} \).
e) \( \frac{8}{10} + \frac{7}{10} = \frac{8+7}{10} = \frac{15}{10} = \frac{3}{2} \).