Пошаговое объяснение:
1)
24/25 и 3/5; 24/25 и 15/25
2)
11/36 и 7/12; 11/36 и 21/36
3)
3/4 и 19/40; 30/40 и 19/40
4)
5/6 и 31/42; 35/42 и 31/42
