Задача 2: Найдите сумму:

а) \(\frac{1}{6} + \frac{2}{11} + \frac{4}{5} + \frac{7}{11}\) = \(\frac{1}{6} + \frac{2}{11} + \frac{7}{11} + \frac{4}{5}\) = \(\frac{1}{6} + \frac{9}{11} + \frac{4}{5}\) = \(\frac{1*55}{6*55} + \frac{9*30}{11*30} + \frac{4*66}{5*66}\) = \(\frac{55}{330} + \frac{270}{330} + \frac{264}{330}\) = \(\frac{589}{330}\) б) \(\frac{2}{3} + \frac{3}{18} + \frac{5}{6} + \frac{7}{18}\) = \(\frac{2}{3} + \frac{5}{6} + \frac{3}{18} + \frac{7}{18}\) = \(\frac{2}{3} + \frac{5}{6} + \frac{10}{18}\) = \(\frac{2}{3} + \frac{5}{6} + \frac{5}{9}\) = \(\frac{2*6}{3*6} + \frac{5*3}{6*3} + \frac{5*2}{9*2}\) = \(\frac{12}{18} + \frac{15}{18} + \frac{10}{18}\) = \(\frac{37}{18}\)