1. Выполните действия: а) \(\frac{7}{10}+\frac{2}{15}\); б) \(\frac{3}{4}-\frac{5}{28}\); в) \(\frac{6}{35}\cdot\frac{7}{24}\); г) \(\frac{10}{27}:\frac{25}{36}\).

1. а) \(\frac{7}{10}+\frac{2}{15}=\frac{21}{30}+\frac{4}{30}=\frac{25}{30}=\frac{5}{6}\).
2. б) \(\frac{3}{4}-\frac{5}{28}=\frac{21}{28}-\frac{5}{28}=\frac{16}{28}=\frac{4}{7}\).
3. в) \(\frac{6}{35}\cdot\frac{7}{24}=\frac{1}{5}\cdot\frac{1}{4}=\frac{1}{20}\).
4. г) \(\frac{10}{27}:\frac{25}{36}=\frac{10}{27}\cdot\frac{36}{25}=\frac{8}{15}\).

Ответ: а) \(\frac{5}{6}\); б) \(\frac{4}{7}\); в) \(\frac{1}{20}\); г) \(\frac{8}{15}\).