Вычисли

а) \(\cfrac{^2/ \,1}{\,3}-\cfrac{1}{6}=\cfrac{2}{6}-\dfrac{1}{6}=\dfrac{1}{6}\) ;

б) \(\dfrac{3}{5}-\dfrac{2}{15}=\) [ ] \(-\dfrac{2}{15}=\) [ ];

в) \(\dfrac{9}{12}-\dfrac{1}{3}=\dfrac{9}{12}-\) [ ] \(=\) [ ];

г) \(\dfrac{7}{16}-\dfrac{1}{4}=\dfrac{7}{16}-\) [ ] \(=\) [ ];

д) \(\dfrac{11}{13}-\dfrac{5}{26}=\) [ ] \(-\) [ ] \(=\) [ ];

е) \(\dfrac{61}{60}-\dfrac{1}{2}=\) [ ] \(-\) [ ] \(=\) [ ].