Bonjour
Compléter :
25/18-7/6=2/9
2/9 = (2 x 2) / (2 x 9) = 4/18
25/18 - ?/18 = 4/18
25/18 - 21/18 = 4/18
21/18 = (3 x 7) / (3 x 6) = 7/6
