Bonjour
5/2 = (5 x 6) / (2 x 6) = 30/12
1/3 = (1x 4) / (3 x 4) = 4/12
1/6 = (1 x 2) / (6 x 2) = 2/12
5/4 = (5 x 3) / (4 x 3) = 15/12
2/7 = (2x 9) / (7 x 9) = 18/63
9/2 = il manque la suite
6/5 = (6 x 3) / (5 x 3) = 18/15
3/11 = (3 x 6) / (11 x 6) = 18/66.