Для варианта 3 необходимо выполнить следующие вычисления:
1) 2 1/3 + 1/7 = 2 7/21 + 3/21 = 2 10/21
2) 5 2/6 + 1/7 = 5 14/42 + 6/42 = 5 20/42 = 5 10/21
3) 1 3/2 + 1/8 = 1 12/16 + 2/16 = 1 14/16 = 1 7/8
4) 2 1/2 + 1/15 = 2 15/30 + 2/30 = 2 17/30
5) 1 1/21 + 1/14 = 1 2/42 + 3/42 = 1 5/42
6) 1 1/2 + 1/3 = 1 3/6 + 2/6 = 1 5/6
7) 4 3/35 + 1/56 = 4 24/280 + 5/280 = 4 29/280
8) 1 1/2 + 1/3 = 1 3/6 + 2/6 = 1 5/6
9) 7 1/19 + 1/60 = 7 60/1140 + 19/1140 = 7 79/1140
10) 5 5/24 + 1/48 = 5 10/48 + 1/48 = 5 11/48
11) 7 1/54 + 1/36 = 7 2/108 + 3/108 = 7 5/108
12) 2 1/17 + 1/13 = 2 13/221 + 17/221 = 2 30/221
13) 1 1/50 + 1/300 = 1 6/300 + 1/300 = 1 7/300
14) 10 7/9 + 1/3 = 10 7/9 + 3/9 = 10 10/9 = 11 1/9
15) 1 1/15 + 1/30 = 1 2/30 + 1/30 = 1 3/30 = 1 1/10
16) 6 1/18 + 1/3 = 6 1/18 + 6/18 = 6 7/18
Итоговые значения:
2 10/21, 5 10/21, 1 7/8, 2 17/30, 1 5/42, 1 5/6, 4 29/280, 1 5/6, 7 79/1140, 5 11/48, 7 5/108, 2 30/221, 1 7/300, 11 1/9, 1 1/10, 6 7/18.