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Приведи дроби к наименьшему общему знаменателю.

1. \(\dfrac{5}{7}\) и \(\dfrac{1}{2} =\) [ ]
   и
   [ ].
2. \(\dfrac{7}{20}\) и \(\dfrac{1}{15} =\) [ ]
   и
   [ ].
3. \(\dfrac{3}{26}\) и \(\dfrac{5}{39} =\) [ ]
   и
   [ ].
4. \(\dfrac{8}{11}\) и \(\dfrac{5}{8} =\) [ ]
   и
   [ ].
5. \(\dfrac{7}{13}\) и \(\dfrac{2}{11} =\) [ ]
   и
   [ ].