The expressions can be calculated as follows:
13/15 + 12/15 = 25/15 = 5/35/12 - 1 = 5/12 - 12/12 = -7/122/15 + 4/5 = 2/15 + 12/15 = 14/1524 1/5 = 24 + 1/5 = 24 1/518/21 + 17/21 = 35/21 = 5/3
Therefore, the answers are:5/3, -7/12, 14/15, 24 1/5, 5/3
The expressions can be calculated as follows:
13/15 + 12/15 = 25/15 = 5/3
5/12 - 1 = 5/12 - 12/12 = -7/12
2/15 + 4/5 = 2/15 + 12/15 = 14/15
24 1/5 = 24 + 1/5 = 24 1/5
18/21 + 17/21 = 35/21 = 5/3
Therefore, the answers are:
5/3, -7/12, 14/15, 24 1/5, 5/3