Вычисли

а) \(\cfrac{^2/ \,5}{\,6}+\cfrac{^3/ \,1}{\,4}=\cfrac{10}{12}+\cfrac{3}{12}=\cfrac{13}{12}\) ;

б) \(\dfrac{^3/ \,1}{\,6}+\dfrac{^2/ \,2}{\,9}=\) [ ] \(+\) [ ] \(=\) [ ];

в) \(\dfrac{3}{8}+\dfrac{1}{6}=\) [ ] \(+\) [ ] \(=\) [ ];

г) \(\dfrac{7}{18}+\dfrac{5}{12}=\) [ ] \(+\) [ ] \(=\) [ ];

д) \(\dfrac{3}{22}+\dfrac{4}{33}=\) [ ] \(+\) [ ] \(=\) [ ];

е) \(\dfrac{7}{30}+\dfrac{1}{40}=\) [ ] \(+\) [ ] \(=\) [ ].