Решение:
1) 2/9 и 4/15,
НОК (9,15) = 45;
2/9 = (2•5))(9•5) = 10/45; 4/15 = (4•3))(15•3) = 12/45;
2) 7/25 и 2/15,
НОК (25,15) = 75;
7/25 = (7•3))(25•3) = 21/75; 2/15 = (2•5))(15•5) = 10/75; ,
2) 3/16 и 5/24,
НОК ( 16,24) = 48;
3/16 = (3•3))(16•3) = 9/48;
5/24 = (5•2))(24•2) = 10/48.