1) 1/10 + 1/15 = 3/30 + 2/30 = 5/30 = 1/6 2) 12 6/7 * 1/6 = 90/7 * 1/6 = 90/42 = 45/21 = 2 3/21 3) 15 6/7 - 2 3/21 = 15 18/21 - 2 3/21 = 13 15/21 ОТВЕТ 13 целых 15/21
Решите задачу: