Ответ:

а) \(7\dfrac{2}{9}+4=11\dfrac{2}{9}\).

б) \(4\dfrac{3}{5}+\dfrac{2}{3}=4+\dfrac{9}{15}+\dfrac{10}{15}=5\dfrac{4}{15}\).

в) \(1-\dfrac{3}{4}=\dfrac{1}{4}\).

г) \(5-2\dfrac{2}{5}=2\dfrac{3}{5}\).

д) \(1\dfrac{5}{12}-\dfrac{9}{10}=1+\dfrac{25}{60}-\dfrac{54}{60}=\dfrac{31}{60}\).

е) \(10\dfrac{1}{2}-4\dfrac{9}{14}=\dfrac{147}{14}-\dfrac{65}{14}=\dfrac{82}{14}=5\dfrac{6}{7}\).

Ответ: а) \(11\dfrac{2}{9}\); б) \(5\dfrac{4}{15}\); в) \(\dfrac{1}{4}\); г) \(2\dfrac{3}{5}\); д) \(\dfrac{31}{60}\); е) \(5\dfrac{6}{7}\).