Выполните действия с дробями, у которых одинаковые знаменатели: 3 2 a) 13+13 6) 32 20 38 38 в) 5-+9 7 8 11 11 3 19 г) 3 + 20 20 5 15 д) 7-20 17 17

a) $$ \frac{3}{13} + \frac{2}{13} = \frac{3+2}{13} = \frac{5}{13} $$

б) $$ \frac{32}{38} - \frac{20}{38} = \frac{32-20}{38} = \frac{12}{38} = \frac{6}{19} $$

в) $$ 5\frac{7}{11} + 9\frac{8}{11} = (5 + 9) + (\frac{7}{11} + \frac{8}{11}) = 14 + \frac{7+8}{11} = 14 + \frac{15}{11} = 14 + 1\frac{4}{11} = 15\frac{4}{11} $$

г) $$ 3\frac{3}{20} + \frac{19}{20} = 3 + \frac{3}{20} + \frac{19}{20} = 3 + \frac{3+19}{20} = 3 + \frac{22}{20} = 3 + \frac{11}{10} = 3 + 1\frac{1}{10} = 4\frac{1}{10} $$

д) $$ 7\frac{5}{17} - 2\frac{15}{17} = (7 - 2) + (\frac{5}{17} - \frac{15}{17}) = 5 + \frac{5-15}{17} = 5 - \frac{10}{17} = 4 + \frac{17}{17} - \frac{10}{17} = 4 + \frac{17-10}{17} = 4\frac{7}{17} $$

Ответ: а) $$\frac{5}{13}$$, б) $$\frac{6}{19}$$, в) $$15\frac{4}{11}$$, г) $$4\frac{1}{10}$$, д) $$4\frac{7}{17}$$