3 3/4 : 1 1/2 + 1 1/2 : 3 3/4 * 2 1/2 = 15/4 : 3/2 + 3/2 : 15/4 * 5/2 = 15/4 * 2/3 + 3/2 * 4/15 * 5/2 = 5/2 + 2/5 * 5/2 = 5/2 + 1 = 5/2 + 2/2 = 7/4 = 1 3/4 числитель
2 : 3 1/5 + 3 1/4 : 13 : 2/3 = 2 : 16/5 + 13/4 : 13 : 2/3 = 2 * 5/16 + 13/4 * 1/13 : 2/3 = 5/8 + 1/4 * 3/2 = 5/8 + 3/8 = 8/8 = 1 знаменатель
1 3/4
------- = 1 3/4 ответ
1