2. Найдите значение выражения: а) 3/14 + (2/7 + 1/2); б) 11/56 + (6/7 − 3/8); в) (5/8 + 1/6) − 7/24; г) 15/36 − (1/3 − 1/12).

1. а) \(\frac{3}{14}+\left(\frac{2}{7}+\frac{1}{2}\right)=\frac{3}{14}+\left(\frac{4}{14}+\frac{7}{14}\right)=\frac{14}{14}=1\).
2. б) \(\frac{11}{56}+\left(\frac{6}{7}-\frac{3}{8}\right)=\frac{11}{56}+\left(\frac{48}{56}-\frac{21}{56}\right)=\frac{11}{56}+\frac{27}{56}=\frac{38}{56}=\frac{19}{28}\).
3. в) \(\left(\frac{5}{8}+\frac{1}{6}\right)-\frac{7}{24}=\left(\frac{15}{24}+\frac{4}{24}\right)-\frac{7}{24}=\frac{12}{24}=\frac{1}{2}\).
4. г) \(\frac{15}{36}-\left(\frac{1}{3}-\frac{1}{12}\right)=\frac{5}{12}-\left(\frac{4}{12}-\frac{1}{12}\right)=\frac{5}{12}-\frac{3}{12}=\frac{2}{12}=\frac{1}{6}\).

Ответ: а) 1; б) \(\frac{19}{28}\); в) \(\frac{1}{2}\); г) \(\frac{1}{6}\).