Вычисли: 1) 5/7 : 3/4; 2) 5/18 : 2/45; 3) 6/7 : 3; 4) 3 : 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) 20/21; 2) 6 1/4; 3) 2/7; 4) 3 1/2.