Ответ:

а) \(9\dfrac{4}{11}+3=12\dfrac{4}{11}\).

б) \(6\dfrac{5}{7}+\dfrac{4}{5}=6+\dfrac{25}{35}+\dfrac{28}{35}=7\dfrac{18}{35}\).

в) \(9-\dfrac{11}{12}=8\dfrac{1}{12}\).

г) \(8\dfrac{3}{11}-4=4\dfrac{3}{11}\).

д) \(5\dfrac{7}{8}-\dfrac{9}{10}=5+\dfrac{35}{40}-\dfrac{36}{40}=6\dfrac{11}{40}\).

е) \(2\dfrac{3}{10}-1\dfrac{11}{15}=1+\dfrac{9}{30}-\dfrac{22}{30}=\dfrac{17}{30}\).

Ответ: а) \(12\dfrac{4}{11}\); б) \(7\dfrac{18}{35}\); в) \(8\dfrac{1}{12}\); г) \(4\dfrac{3}{11}\); д) \(6\dfrac{11}{40}\); е) \(\dfrac{17}{30}\).