1) 3/7 + 4/7 + 14/19 + 5/19 = 7/7 + 19/19 = 1 + 1 = 2
2) 7/16 + 9/16 + 11/42 + 17/42 = 16/16 + 28/42 = 1 + 2/3 = 1 2/3
3) 5/18 + 7/18 + 11/81 + 5/81 = 12/18 + 16/81 = 2/3 + 16/81 = 54/81 + 16/81 = 70/81
1)2
2)1 2/3
3)70/81
вот правильные ответы
