Выполним сложение смешанных чисел:
a) $$6\frac{5}{8}+\frac{2}{8} = 6\frac{5+2}{8} = 6\frac{7}{8}$$
б) $$2\frac{2}{9}+3\frac{5}{9} = (2+3) + (\frac{2}{9}+\frac{5}{9}) = 5 + \frac{2+5}{9} = 5 + \frac{7}{9} = 5\frac{7}{9}$$
в) $$4+2\frac{2}{3} = 6\frac{2}{3}$$
г) $$3\frac{5}{7}+8 = 3 + \frac{5}{7} + 8 = 11\frac{5}{7}$$
д) $$4\frac{3}{8}+2\frac{5}{8} = (4+2) + (\frac{3}{8}+\frac{5}{8}) = 6 + \frac{3+5}{8} = 6 + \frac{8}{8} = 6 + 1 = 7$$
e) $$2\frac{7}{13}+3\frac{8}{13} = (2+3) + (\frac{7}{13}+\frac{8}{13}) = 5 + \frac{7+8}{13} = 5 + \frac{15}{13} = 5 + 1\frac{2}{13} = 6\frac{2}{13}$$
Ответ: