Question

1 supra 2 : 1 supra 4
3 supra 5 : 1 supra 25
7 \12: 14\3

Answer 1

1/2 :1/4 = 1/2 * 4/1 = 4/2 = 2 ;

3/5 : 1/25 = 3/5 * 25/1 = 75/5 = 15 ;

7/12 : 14/3 = 7/12 * 3/14 = (simplific cu 3 si 7 )
                  =  1/4  * 1/7   = 1/28 ;