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Найди общий знаменатель дробей.

a) \(\dfrac 1 2\) и \(\dfrac 1 3; \) [ ]

b) \(\dfrac 1 5\) и \(\dfrac 1 6; \) [ ]

c) \(\dfrac 1 4\) и \(\dfrac 1 8;\) [ ]

d) \(\dfrac 1 {14}\) и \(\dfrac 1 {21}\) [ ].