1/2+1/4 2/3+1/6 5/8+5/24 1/2-1/8 2/3-4/9 3/4-1/12

2/3+1/6=5/6 5/8+5/24=20/24 и так далее  ...............................................................................

1/2 + 1/4 = 2/4 + 1/4 = 3/4 2/3 + 1/6 = 4/6 + 1/6 = 5/6 5/8 + 5/24 = 15/24 + 5/24 = 20/24 = 5/6 1/2 - 1/8 = 4/8 - 1/8 = 3/8 2/3 - 4/9 = 6/9 - 4/9 = 2/9 3/4 - 1/12 = 9/12 - 1/12 = 8/12 = 2/3