Ответ:

9/28, 3/14, 1/4

Пошаговое объяснение:

19/56 = 19*2/56*2 = 38/112

43/112 =43/112

9/28 = 9*4/28*4 = 36/112

3/14 = 3*8/14*8 = 24/112

3/8 = 3*14/8*14 = 42/112

1/4 = 1*28/4*28 = 28/112

Ответ: 9/28, 3/14, 1/4.