2.174 Найдите сумму: б) \(\frac{5}{11} + \frac{2}{3} + \frac{1}{9} + \frac{6}{11}\);

б) Найдем сумму:

\(\frac{5}{11} + \frac{2}{3} + \frac{1}{9} + \frac{6}{11} = (\frac{5}{11} + \frac{6}{11}) + (\frac{2}{3} + \frac{1}{9}) = \frac{5+6}{11} + \frac{2 \cdot 3 + 1}{9} = \frac{11}{11} + \frac{6+1}{9} = 1 + \frac{7}{9} = 1\frac{7}{9}\)

Ответ: \(1\frac{7}{9}\)