Вариант 3. 2. Выполните действия: a) 1/5 + 4/11; б) 3/7 + 5/14; в) 8/9 - 7/12; г) 11/50 + 3/25 - 1/20

a) \(\frac{1}{5} + \frac{4}{11} = \frac{11}{55} + \frac{20}{55} = \frac{31}{55}\) b) \(\frac{3}{7} + \frac{5}{14} = \frac{6}{14} + \frac{5}{14} = \frac{11}{14}\) c) \(\frac{8}{9} - \frac{7}{12} = \frac{32}{36} - \frac{21}{36} = \frac{11}{36}\) d) \(\frac{11}{50} + \frac{3}{25} - \frac{1}{20} = \frac{22}{100} + \frac{12}{100} - \frac{5}{100} = \frac{22+12-5}{100} = \frac{29}{100}\)