5/6 + 1/6 = 6/6 = 1
4/5 + 3/5 = 7/5 = 5/5 + 2/5 = 1 целая 2/5
5/8 - 1/8 = 4/8 = 1/2 (дробь 4/8 сократили на 4)
2/3 - 1/4 = 8/12 - 3/12 = 5/12
1,2 + 6,43 = 7,63
10,53 - 6,4 = 4,13
5/6 + 1/6 = 6/6 = 1
4/5 + 3/5 = 7/5 = 5/5 + 2/5 = 1 целая 2/5
5/8 - 1/8 = 4/8 = 1/2 (дробь 4/8 сократили на 4)
2/3 - 1/4 = 8/12 - 3/12 = 5/12
1,2 + 6,43 = 7,63
10,53 - 6,4 = 4,13