Выполните действия:
а) \(8\frac{1}{3} + 6\frac{1}{2} - 3\frac{5}{6} = 11\)
1) \(8\frac{1}{3} + 6\frac{1}{2} = 8 + \frac{2}{6} + 6 + \frac{3}{6} = 14 + \frac{5}{6} = 14\frac{5}{6}\);
2) \(14\frac{5}{6} - 3\frac{5}{6} = 11\).

б) \(12\frac{3}{8} - 5\frac{1}{4} + 7\frac{1}{2} = 14\frac{5}{8}\)
1) \(12\frac{3}{8} - 5\frac{1}{4} = 12\frac{3}{8} - 5\frac{2}{8} = 7\frac{1}{8}\);
2) \(7\frac{1}{8} + 7\frac{1}{2} = 7 + \frac{1}{8} + 7 + \frac{4}{8} = 14 + \frac{5}{8} = 14\frac{5}{8}\).

в) \(2\frac{1}{3} \cdot \frac{3}{10} : 2\frac{4}{5} = \frac{1}{4} = 0,25\)
1) \(2\frac{1}{3} \cdot \frac{3}{10} = \frac{7}{3} \cdot \frac{3}{10} = \frac{7 \cdot 3}{3  \cdot 10} = \frac{7 \cdot 1}{1 \cdot 10} =  \frac{7}{10} = 0,7\);
2) \(\frac{7}{10} : 2\frac{4}{5} = \frac{7}{10} : \frac{14}{5} = \frac{7}{10} \cdot \frac{5}{14} = \frac{7 \cdot 5}{10 \cdot 14} = \frac{1 \cdot 1}{2 \cdot 2} = \frac{1}{4}\).

г) \(1\frac{1}{6} : 2\frac{1}{6} \cdot 26 = \frac{1}{4} = 14\)
1) \(1\frac{1}{6} : 2\frac{1}{6} = \frac{7}{6} : \frac{13}{6} = \frac{7}{6} \cdot \frac{6}{13} = \frac{7 \cdot 6}{6 \cdot 13} = \frac{7 \cdot 1}{1 \cdot 13} = \frac{7}{13}\);
2) \(\frac{7}{13} \cdot 26 = 7 \cdot 2 = 14\).