а) 2 целых 3/7 умножить на 7 = 2 7 + 3/7 7 = 14 + 3 = 17
б) (2/9 + 2/3) 3 = (2/9 + 6/9) 3 = 8/9 * 3 = 24/9 = 8/3 = 2 целых 2/3
в) 5/12 2 целых 3/7 + 5/12 3 целых 4/7 = 5/12 21/7 + 5/12 25/7 = 105/84 + 125/84 = 230/84 = 115/42 = 2 целых 31/42
а) 2 целых 3/7 умножить на 7 = 2 7 + 3/7 7 = 14 + 3 = 17
б) (2/9 + 2/3) 3 = (2/9 + 6/9) 3 = 8/9 * 3 = 24/9 = 8/3 = 2 целых 2/3
в) 5/12 2 целых 3/7 + 5/12 3 целых 4/7 = 5/12 21/7 + 5/12 25/7 = 105/84 + 125/84 = 230/84 = 115/42 = 2 целых 31/42