Объяснение:
1/6 + 1/9 = 3/18 + 2/18 = 5/18;
2/9 + 5/6 = 4/18 + 15/18 = 19/18;
2/9 + 3/8 = 16/54 + 27/54 = 43/54.
2/10 + 6/15 = 6/30 + 12/30 = 18/30 = 3/5.
3/10 + 2/12 = 18/60 + 10/60 = 28/60 = 14/30 = 7/15.
5/12 + 4/15 = 25/60 + 16/60 = 41/60.
3/4 + 5/18 = 24/32 + 10/32 = 34/32 = 1 2/32 = 1 1/16.
2/26 + 3/39 = 6/78 + 6/78 = 12/78 = 6/39 = 2/13.
7/34 + 5/51 = 21/102 + 10/102 = 31/102.
4/210 + 5/140 = 8/420 + 15/420 = 23/420.
7/450 + 8/180 = 14/900 + 40/900 = 54/900 = 18/300 = 6/100 = 3/50.
9/180 + 7/120 = 18/360 + 21/360 = 39/360 = 13/120.
