Вычисли

а) \(\raisebox{-1em}{\)\dfrac{1}{9}+\dfrac{7}{9}=\(}\) \(\mathrlap{\,\raisebox{-1em}{\)\begin{array}{c}, \phantom{8} ,\ \hline9\ \end{array} \(}}\) [ ];

б) \(\raisebox{-1em}{\)\dfrac{3}{7}+\dfrac{2}{7}=\(}\) \(\mathrlap{\,\raisebox{-1em}{\)\begin{array}{c}, \phantom{5} ,\ \hline7\ \end{array} \(}}\) [ ];

в) \(\raisebox{-1em}{\)\dfrac{3}{11}+\dfrac{5}{11}=\(}\) \(\mathrlap{\,\raisebox{-1em}{\)\begin{array}{c}, \phantom{8} ,\ \hline11\ \end{array} \(}}\) [ ];

г) \(\dfrac{3}{13} + \dfrac{1}{13} =\) [ ];

д) \(\dfrac{7}{17} + \dfrac{8}{17} =\) [ ];

е) \(\dfrac{6}{15} + \dfrac{7}{15} =\) [ ].