Bonjour,
52/507 = (2²×13)/(13²×3) = 2²/(13×3) = 4/39
525/945 = (7×5²×3)/(7×5×3³) = 5/3² = 5/9
507/99 = (13²×3)/(3²×11) = 13²/(3×11) = 169/33
1225/525 = (7²×5²)/(7×5²×3) = 7/3
1225/945 = (7²×5²)/(7×5×3³) = (7×5)/3³ = 35/27
525/52 = (7×5²×3)/(2²×13) pas simplifiable
