bjr
3120 = 312 x 10 = 2 x 156 x 10 = 2 x 2 x 78 x 10 = 2 x 2 x 2 x 39 x 10
= 2 x 2 x 2 x 2 x 5 x 3 x 13 = 2⁴ x 3 x 5 x 13
2760 = 276 x 10 = 2 x 138 x 10 = 2 x 2 x 69 x 10 = 2 x 2 x 3 x 23 x 10
= 2 x 2 x 3 x 23 x 5 x 2 = 2³ x 3 x 5 x 23
PGCD(3120;2760) = 2³ x 3 x 5 = 120
donc fraction simplifiable par 120
on n'a pas la fraction...
