- \(\frac{4}{5}-\frac{5}{8}=\frac{32}{40}-\frac{25}{40}=\frac{7}{40}\).
- \(\frac{5}{18}+\frac{4}{45}=\frac{25}{90}+\frac{8}{90}=\frac{33}{90}=\frac{11}{30}\).
- \(10\frac{18}{25}-8=2\frac{18}{25}\).
- \(4\frac{2}{3}-1\frac{1}{6}=3\frac{4}{6}-1\frac{1}{6}=2\frac{3}{6}=2\frac{1}{2}\).
- \(2\frac{5}{6}+1\frac{3}{4}=3+\frac{10}{12}+\frac{9}{12}=3\frac{19}{12}=4\frac{7}{12}\).
Ответ: \(\frac{7}{40};\ \frac{11}{30};\ 2\frac{18}{25};\ 2\frac{1}{2};\ 4\frac{7}{12}\).