Найдем сумму:

1. a) $$6 + 8\frac{7}{13} = (6 + 8) + \frac{7}{13} = 14\frac{7}{13}$$
2. б) $$12 + 19\frac{5}{24} = (12 + 19) + \frac{5}{24} = 31\frac{5}{24}$$
3. в) $$5\frac{7}{15} + 8\frac{4}{15} = (5 + 8) + (\frac{7}{15} + \frac{4}{15}) = 13 + \frac{11}{15} = 13\frac{11}{15}$$
4. г) $$13\frac{5}{101} + 7\frac{25}{101} = (13 + 7) + (\frac{5}{101} + \frac{25}{101}) = 20 + \frac{30}{101} = 20\frac{30}{101}$$
5. д) $$4\frac{3}{7} + 15\frac{4}{7} = (4 + 15) + (\frac{3}{7} + \frac{4}{7}) = 19 + \frac{7}{7} = 19 + 1 = 20$$
6. e) $$3\frac{9}{13} + 4\frac{8}{13} = (3 + 4) + (\frac{9}{13} + \frac{8}{13}) = 7 + \frac{17}{13} = 7 + 1 + \frac{4}{13} = 8\frac{4}{13}$$

Ответ:

• a) $$14\frac{7}{13}$$
• б) $$31\frac{5}{24}$$
• в) $$13\frac{11}{15}$$
• г) $$20\frac{30}{101}$$
• д) $$20$$
• e) $$8\frac{4}{13}$$