1/3 + 1/8 = 8/24 + 3/24 = 11/24
5/6 + 1/3 = 5/6 + 2/6 = 7/6 = 1 1/6
5/24 + 5/6 = 5/24 + 20/24 = 25/24 = 1 1/24
1/4 + 1/6 = 3/12 + 2/12 = 5/12
1/6 + 2/9 = 6/36 + 8/36 = 14/36 = 7/18
1/2 - 1/8 = 4/8 - 1/8 = 3/8
5/6 - 1/4 = 10/12 - 3/12 = 7/12
1/6 - 1/12 = 2/12 - 1/12 = 1/12
3/10 - 2/15 = 9/30 - 4/30 = 5/30 = 1/6
11/8 - 5/6 = 33/24 - 20/24 = 13/24
b c b + c
1 строка 1/2
2 строка 1/6
3 строка 1/20
b c b - c
1 строка 5/14
2 строка 3/8
3 строка 7/10