«Деление обыкновенных дробей». 2. Вычисли: 1) \(\frac{5}{7}:\frac{3}{4}\); 2) \(\frac{5}{18}:\frac{2}{45}\); 3) \(\frac{6}{7}:3\); 4) \(3:\frac{6}{7}\).

1. \[\frac{5}{7}:\frac{3}{4}=\frac{5}{7}\cdot\frac{4}{3}=\frac{20}{21}.\]
2. \[\frac{5}{18}:\frac{2}{45}=\frac{5}{18}\cdot\frac{45}{2}=\frac{25}{4}=6\frac{1}{4}.\]
3. \[\frac{6}{7}:3=\frac{6}{7}\cdot\frac{1}{3}=\frac{2}{7}.\]
4. \[3:\frac{6}{7}=3\cdot\frac{7}{6}=\frac{7}{2}=3\frac{1}{2}.\]

Ответ: 1) \(\frac{20}{21}\); 2) \(6\frac{1}{4}\); 3) \(\frac{2}{7}\); 4) \(3\frac{1}{2}\).