Пошаговое объяснение:
1 31/35 : (2 - 8/9 : 1 19/45) = 1 13/35
8/9 : 1 19/45 = 8/9 : 64/45 = 8/9 * 45/64 = 5/8
2 - 5/8 = 11/8
1 31/35 : 11/8 = 66/35 : 11/8 = 66/35 * 8/11 = 48/35 = 1 13/35
