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Вычисли:

а) \(\dfrac{5}{12} - \dfrac{1}{12} = \dfrac{4}{12} = \dfrac{1}{3}\) ;

\(\dfrac{3}{16} + \dfrac{5}{16} = \) [ ] \(=\) [ ];

\(\dfrac{7}{9} - \dfrac{1}{9} = \) [ ] \(=\) [ ];

\(\dfrac{9}{14} + \dfrac{1}{14} = \) [ ] \(=\) [ ].

б) \(\dfrac{8}{21} - \dfrac{5}{21} = \) [ ] \(=\) [ ];

\(\dfrac{5}{8} + \dfrac{1}{8} = \) [ ] \(=\) [ ];

\(\dfrac{11}{18} - \dfrac{7}{18} = \) [ ] \(=\) [ ];

\(\dfrac{8}{15} + \dfrac{2}{15} = \) [ ] \(=\) [ ].