Решение:

a) 6$$\frac{5}{8}$$ + 2$$\frac{2}{8}$$ = (6 + 2) + ($$\frac{5}{8}$$ + $$\frac{2}{8}$$) = 8 + $$\frac{7}{8}$$ = 8$$\frac{7}{8}$$

б) 2$$\frac{2}{9}$$ + 3$$\frac{5}{9}$$ = (2 + 3) + ($$\frac{2}{9}$$ + $$\frac{5}{9}$$) = 5 + $$\frac{7}{9}$$ = 5$$\frac{7}{9}$$

в) 4 + 2$$\frac{2}{3}$$ = 6$$\frac{2}{3}$$

г) 3$$\frac{5}{7}$$ + 8 = 11$$\frac{5}{7}$$

д) 4$$\frac{3}{8}$$ + 2$$\frac{5}{8}$$ = (4 + 2) + ($$\frac{3}{8}$$ + $$\frac{5}{8}$$) = 6 + $$\frac{8}{8}$$ = 6 + 1 = 7

е) 2$$\frac{7}{13}$$ + 3$$\frac{8}{13}$$ = (2 + 3) + ($$\frac{7}{13}$$ + $$\frac{8}{13}$$) = 5 + $$\frac{15}{13}$$ = 5 + 1$$\frac{2}{13}$$ = 6$$\frac{2}{13}$$