219. Выполните сложение: a) $$6\frac{5}{8} + \frac{2}{8}$$; б) $$2\frac{2}{9} + 3\frac{5}{9}$$; в) $$4 + 2\frac{2}{3}$$; г) $$3\frac{5}{7} + 8$$; д) $$4\frac{3}{8} + 2\frac{5}{8}$$; е) $$2\frac{7}{13} + 3\frac{8}{13}$$

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) $$4 + 2\frac{2}{3} = (4+2) + \frac{2}{3} = 6\frac{2}{3}$$ г) $$3\frac{5}{7} + 8 = (3+8) + \frac{5}{7} = 11\frac{5}{7}$$ д) $$4\frac{3}{8} + 2\frac{5}{8} = (4+2) + (\frac{3}{8} + \frac{5}{8}) = 6 + \frac{3+5}{8} = 6 + \frac{8}{8} = 6 + 1 = 7$$ е) $$2\frac{7}{13} + 3\frac{8}{13} = (2+3) + (\frac{7}{13} + \frac{8}{13}) = 5 + \frac{7+8}{13} = 5 + \frac{15}{13} = 5 + 1\frac{2}{13} = 6\frac{2}{13}$$