Пошаговое объяснение:
11 2/7 + 4 3/4 - 6 4/7 = 11 8/28 + 4 21/28 - 6 16/28 = (11 + 4 - 6) (8/28 + 21/28 - 16/28) = 9 13/28
8 - 4 31/100 - 2 57/100 = 7 100/100 - 4 31/100 - 2 57/100 = (7 - 4 - 2) (100/100 - 31/100 - 57/100) = 1 12/100 = 1 3/25
