1/2 + 1/4 = 2/4 + 1/4 = 3/4
2/3 + 1/6 = 4/6 + 1/6 = 5/6
7/12 + 1/2 = 7/12 + 6/12 = 13/12 (неупрощаемая дробь)
1/8 + 3/4 = 1/8 + 6/8 = 7/8
1/2 + 3/8 = 4/8 + 3/8 = 7/8
3/5 + 1/10 = 6/10 + 1/10 = 7/10
2/3 + 1/12 = 8/12 + 1/12 = 9/12 = 3/4
5/8 + 5/24 = 15/24 + 5/24 = 20/24 = 5/6