5) 1 1/2 * 7/9 * 2 8/14

Преобразуем 1 1/2 в 3/2 и 2 8/14 в 30/14: (3/2) * (7/9) * (30/14) = (3 * 7 * 30) / (2 * 9 * 14) = 630 / 252 = 105 / 42 = 35 / 14 = 5/2. Ответ: 5/2.