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а) \(\dfrac{3}{60}=\dfrac{\overset{\tiny 1}{\cancel{3}}\cdot 1}{\underset{\tiny 1}{\cancel{3}}\cdot 20}=\dfrac{1}{20}\) ;

б) \(\dfrac{5}{20}=\) [ ] \(=\) [ ];

в) \(\dfrac{4}{14}=\) [ ] \(=\) [ ];

г) \(\dfrac{3}{15}=\) [ ] \(=\) [ ];

д) \(\dfrac{10}{12}=\) [ ] \(=\) [ ];

е) \(\dfrac{25}{60}=\) [ ] \(=\) [ ];

ж) \(\dfrac{25}{35}=\) [ ] \(=\) [ ];

з) \(\dfrac{28}{35}=\) [ ] \(=\) [ ];

и) \(\dfrac{42}{63}=\) [ ] \(=\) [ ].