Răspuns :
a - b = 13 / 8
a = 5 / 12
5 / 12 - b = 13 / 8
10 / 24 - b = 39 / 24
b = 39 / 24 - 10 / 24
b = 29 / 24
a = 5 / 12
5 / 12 - b = 13 / 8
10 / 24 - b = 39 / 24
b = 39 / 24 - 10 / 24
b = 29 / 24