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а)

\(\raisebox{-1em}{\)\dfrac{1}{2} + \dfrac{3}{7} =\(}\) \(\mathrlap{\,\raisebox{-1em}{\)\begin{array}{c}, \phantom{13} ,\ \hline14\ \end{array} \(}}\) [ ];

\(\raisebox{-1em}{\)\dfrac{1}{3} + \dfrac{1}{8} =\(}\) \(\mathrlap{\,\raisebox{-1em}{\)\begin{array}{c}, \phantom{11} ,\ \hline24\ \end{array} \(}}\) [ ];

\(\raisebox{-1em}{\)\dfrac{5}{6} + \dfrac{1}{3} =\(}\) \(\mathrlap{\,\raisebox{-1em}{\)\begin{array}{c}, \phantom{7} ,\ \hline6\ \end{array} \(}}\) [ ].

б)

\(\raisebox{-1em}{\)\dfrac{5}{24} + \dfrac{5}{6} =\(}\) \(\mathrlap{\,\raisebox{-1em}{\)\begin{array}{c}, \phantom{25} ,\ \hline24\ \end{array} \(}}\) [ ];

\(\raisebox{-1em}{\)\dfrac{1}{4} + \dfrac{1}{6} =\(}\) \(\mathrlap{\,\raisebox{-1em}{\)\begin{array}{c}, \phantom{5} ,\ \hline12\ \end{array} \(}}\) [ ];

\(\raisebox{-1em}{\)\dfrac{1}{6} + \dfrac{2}{9} =\(}\) \(\mathrlap{\,\raisebox{-1em}{\)\begin{array}{c}, \phantom{21} ,\ \hline18\ \end{array} \(}}\) [ ].