Ответ:

  1. \(1\frac{4}{5}=\frac{1\cdot5+4}{5}=\frac{9}{5}\).
  2. \(3\frac{7}{8}=\frac{3\cdot8+7}{8}=\frac{31}{8}\).
  3. \(10\frac{7}{18}=\frac{10\cdot18+7}{18}=\frac{187}{18}\).
  4. \(5\frac{3}{12}=\frac{5\cdot12+3}{12}=\frac{63}{12}=\frac{21}{4}\).

Ответ: \(\frac{9}{5};\ \frac{31}{8};\ \frac{187}{18};\ \frac{21}{4}\).