Bonjour,
60 = 2 × 2 × 3 × 5
126 = 2 × 3 × 3 × 7
donc : 60/126 = (2×2×3×5)/(2×3×3×7) = (2×5)/(3×7) = 10/21
48 = 2 × 2 × 2 × 2 × 3
75 = 3 × 5 × 5
donc : 48/75 = (2×2×2×2×3)/(3×5×5) = (2×2×2×2)/(5×5) = 16/25
360 = 2 × 2 × 2 × 3 × 3 × 5
252 = 2 × 2 × 3 × 3 × 7
donc : 360/252 = (2×2×2×3×3×5)/(2×2×3×3×7) = (2×5)/7 = 10/7
tu essayes de faire le dernier ?
tu dois arriver à : 220/100 = 11/5