Ответ:

а) \(3\frac{1}{3}+\frac{4}{5}=3+\frac{5}{15}+\frac{12}{15}=3\frac{17}{15}=4\frac{2}{15}.\)

б) \(\frac{3}{7}+2\frac{4}{7}=2+\frac{7}{7}=3.\)

в) \(5\frac{1}{6}+4\frac{5}{6}=9+\frac{6}{6}=10.\)

г) \(2+2\frac{2}{3}=4\frac{2}{3}.\)