в) \(18 + \frac{4}{19}\); г) \(23 + \frac{9}{10}\); д) \(2\frac{2}{9} + \frac{8}{9}\); е) \(15\frac{8}{11} + 4\frac{3}{11}\);

Решение:

1. \(18 + \frac{4}{19} = 18\frac{4}{19}\)
2. \(23 + \frac{9}{10} = 23\frac{9}{10}\)
3. \(2\frac{2}{9} + \frac{8}{9} = 2 + \frac{2}{9} + \frac{8}{9} = 2 + \frac{2+8}{9} = 2 + \frac{10}{9} = 2 + 1\frac{1}{9} = 3\frac{1}{9}\)
4. \(15\frac{8}{11} + 4\frac{3}{11} = 15 + 4 + \frac{8}{11} + \frac{3}{11} = 19 + \frac{8+3}{11} = 19 + \frac{11}{11} = 19 + 1 = 20\)

Ответ: в) \(18\frac{4}{19}\); г) \(23\frac{9}{10}\); д) \(3\frac{1}{9}\); е) 20