Проверочная работа №3. 2. Найдите значение выражения: а) \frac{1}{14} + (\frac{2}{7} + \frac{1}{2}); б) \frac{10}{56} + (\frac{1}{7} - \frac{6}{56}); в) (\frac{5}{8} + \frac{1}{6}) - \frac{7}{24}; г) \frac{15}{36} - (\frac{1}{3} - \frac{1}{12}).

а) \frac{1}{14} + (\frac{2}{7} + \frac{1}{2}) = \frac{1}{14} + (\frac{4}{14} + \frac{7}{14}) = \frac{1}{14} + \frac{11}{14} = \frac{12}{14} = \frac{6}{7}. б) \frac{10}{56} + (\frac{1}{7} - \frac{6}{56}) = \frac{10}{56} + (\frac{8}{56} - \frac{6}{56}) = \frac{10}{56} + \frac{2}{56} = \frac{12}{56} = \frac{3}{14}. в) (\frac{5}{8} + \frac{1}{6}) - \frac{7}{24} = (\frac{15}{24} + \frac{4}{24}) - \frac{7}{24} = \frac{19}{24} - \frac{7}{24} = \frac{12}{24} = \frac{1}{2}. г) \frac{15}{36} - (\frac{1}{3} - \frac{1}{12}) = \frac{15}{36} - (\frac{4}{12} - \frac{1}{12}) = \frac{15}{36} - \frac{3}{12} = \frac{15}{36} - \frac{9}{36} = \frac{6}{36} = \frac{1}{6}.