Ответ:

  1. \(\frac{7}{12}:\frac{49}{60}=\frac{7}{12}\cdot\frac{60}{49}=\frac{5}{7}\).
  2. \(\frac{2}{9}:9=\frac{2}{9}\cdot\frac{1}{9}=\frac{2}{81}\).
  3. \(18:37=\frac{18}{37}\).
  4. \(12:\frac{3}{4}=12\cdot\frac{4}{3}=16\).
  5. \(3\frac{3}{5}:\frac{24}{25}=\frac{18}{5}\cdot\frac{25}{24}=\frac{15}{4}=3\frac{3}{4}\).

Ответ: \(\frac{5}{7};\ \frac{2}{81};\ \frac{18}{37};\ 16;\ 3\frac{3}{4}\).