Ответ: 4 2/9 * 2 4/7 + 1 2/9 * 2 4/7 = 2 4/7 * (4 2/9 + 1 2/9) = 2 4/7 * 5 4/9 = 18/7 * 49/9 = 2 * 7 = 14