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Найди разность:

а) \(\dfrac{4}{7} - \dfrac{1}{2} = \dfrac{8 - 7}{14} = \dfrac{1}{14}\) ;

\(\raisebox{-1em}{\)\dfrac{1}{2} - \dfrac{1}{8} =\(}\) \(\mathrlap{\,\raisebox{-1em}{\)\begin{array}{c}, \phantom{4-1} ,\ \hline8\ \end{array} \(}}\) [ ] \(=\) [ ];

\(\raisebox{-1em}{\)\dfrac{5}{6} - \dfrac{1}{4} =\(}\) \(\mathrlap{\,\raisebox{-1em}{\)\begin{array}{c}, \phantom{10-3} ,\ \hline12\ \end{array} \(}}\) [ ] \(=\) [ ].

б)

\(\dfrac{1}{6} - \dfrac{1}{12} =\) [ ] \(=\) [ ];

\(\dfrac{3}{10} - \dfrac{2}{15} =\) [ ] \(=\) [ ];

\(\dfrac{11}{8} - \dfrac{5}{6} =\) [ ] \(=\) [ ].