6. 58 Найдите сумму: 8 3 a) 13 + 13; б) 31 + 29; 60 60' в) 18 + 4; 19' г) 23 + 9; 10' д) 27 + 8; 9 9' e) 158 + 43. 11 11'

a) \(\frac{8}{13} + \frac{3}{13} = \frac{8+3}{13} = \frac{11}{13}\) б) \(\frac{31}{60} + \frac{29}{60} = \frac{31+29}{60} = \frac{60}{60} = 1\) в) \(18 + \frac{4}{19} = 18\frac{4}{19}\) г) \(23 + \frac{9}{10} = 23\frac{9}{10}\) д) \(2\frac{7}{9} + \frac{8}{9} = 2 + \frac{7}{9} + \frac{8}{9} = 2 + \frac{7+8}{9} = 2 + \frac{15}{9} = 2 + 1\frac{6}{9} = 3\frac{6}{9} = 3\frac{2}{3}\) e) \(15\frac{8}{11} + 4\frac{3}{11} = 15 + 4 + \frac{8}{11} + \frac{3}{11} = 19 + \frac{8+3}{11} = 19 + \frac{11}{11} = 19 + 1 = 20\)