4. Найдите разность (2 вариант)

a) \(1 - \frac{7}{11} = \frac{11}{11} - \frac{7}{11} = \frac{4}{11}\) б) \(20 - 2\frac{1}{5} = 20 - \frac{11}{5} = \frac{100}{5} - \frac{11}{5} = \frac{89}{5} = 17\frac{4}{5}\) в) \(\frac{5}{6} - \frac{2}{3} = \frac{5}{6} - \frac{4}{6} = \frac{1}{6}\) г) \(12\frac{4}{9} - 3\frac{5}{9} = 12 - 3 + \frac{4}{9} - \frac{5}{9} = 9 - \frac{1}{9} = 8\frac{8}{9}\)