Вычисли устно и запиши результат

а) \(\dfrac{1}{3} : \dfrac{2}{5} = \dfrac{5}{6}\) ,

\(\dfrac{1}{2} : \dfrac{1}{5} =\) [ ],

\(\dfrac{1}{3} : \dfrac{1}{4} =\) [ ],

\(\dfrac{1}{6} : \dfrac{2}{7} =\) [ ],

\(\dfrac{2}{3} : \dfrac{1}{5} =\) [ ];

б) \(\dfrac{1}{5} : \dfrac{1}{4} =\) [ ],

\(\dfrac{1}{3} : \dfrac{2}{5} = \) [ ],

\(\dfrac{1}{4} : \dfrac{2}{3} =\) [ ],

\(\dfrac{2}{3} : \dfrac{1}{7} =\) [ ],

\(\dfrac{3}{4} : \dfrac{1}{3} =\) [ ].