1 2/7 * 2 3/5 * 2 1/4 / 5 2/5 * 1 6/7 * 1/4 = 3
Числитель: 1 2/7 * 2 3/5 * 2 1/4 = 7 73/140
1) 1 2/7 * 2 3/5 = 9/7 * 13/5 = 117/35 = 3 12/35
2) 3 12/35 * 2 1/4 = 117/35 * 9/4 = 1053/140 = 7 73/140
Знаменатель: 5 2/5 * 1 6/7 * 1/4 = 2 71/140
1) 5 2/5 * 1 6/7 = 27/5 * 13/7 = 351/35 = 10 1/35
2) 351/35 * 1/4 = 351/140 = 2 71/140
Дробь: 7 73/140 : 2 71/140 = 1053/140 * 140/351 = 1053/351 = 3