Решение:
1. (1\frac{7}{8} = \frac{8+7}{8} = \frac{15}{8})
2. (4 - 2\frac{11}{18} = 4 - \frac{47}{18} = \frac{72-47}{18} = \frac{25}{18})
3. \(\frac{25}{12} : \frac{15}{8} = \frac{25}{12} \cdot \frac{8}{15} = \frac{5 \cdot 2}{3 \cdot 3} = \frac{10}{9}\)
4. \(\frac{3}{5} \cdot \frac{25}{18} = \frac{1}{1} \cdot \frac{5}{6} = \frac{5}{6}\)
5. \(\frac{10}{9} - \frac{5}{6} = \frac{20 - 15}{18} = \frac{5}{18}\)
Ответ: \(\frac{5}{18}\)