Explications étape par étape:
13/2 - 5/12 = 73/12
73/12 - 5/12 = 17/3
17/3 - 5/12 = 21/4
21/4 - 5/12 = 29/6
29/6 - 5/12 = 53/12
53/12 - 5/12 = 4
4 - 5/12 = 43/12
43/12 - 5/12 = 19/6
19/6 - 5/12 = 11/4
11/4 - 5/12 = 7/3
7/3 - 5/12 = 23/12
23/12 - 5/12 = 3/2
3/2 - 5/12 = 13/12
13/12 - 5/12 = 2/3
2/3 - 5/12 = 1/4
