DavryBlack

Ответ:

39/20, 49/30, 57/54, 26/48

Пошаговое объяснение:

11/5 - 1/4 = 44/20 - 5/20 = 39/20

11/6 - 1/5 = 55/30 - 6/30 = 49/30

11/9 - 1/6 = 66/54 - 9/54 - 57/54

11/8 - 5/6 = 66/48 - 40/48 = 26/48