Вычисли и запиши ответы

1. \(\dfrac 76 : \dfrac {14}{3} =\) [ ].
2. \(\dfrac 1{19} : \dfrac {2}{57} =\) [ ].
3. \(\dfrac {31}{8} : \dfrac {155}{56} =\) [ ].
4. \(\dfrac {17}{21} : \dfrac {68}{84} =\) [ ].