Ответ:
а) \(\left(6\frac{2}{3}-2\frac{1}{6}\right)+3\frac{5}{12}=\left(6\frac{8}{12}-2\frac{2}{12}\right)+3\frac{5}{12}=4\frac{1}{2}+3\frac{5}{12}=7\frac{11}{12}\).
б) \(\left(1\frac{2}{15}+5\frac{7}{30}\right)-5\frac{1}{30}=\left(1\frac{4}{30}+5\frac{7}{30}\right)-5\frac{1}{30}=6\frac{11}{30}-5\frac{1}{30}=1\frac{10}{30}=1\frac{1}{3}\).
Ответ: а) \(7\frac{11}{12}\); б) \(1\frac{1}{3}\).
