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Exercice 4 :

Explications étape par étape:

144/342 = 2×9×8/2×9×19 = 8/19

342/1260 = 9×2×19/9×2×70 = 19/70

1260/5700 = 3×3×4×5×7/3×4×5×95 = 21/95

342/5700 = 3×3×2×19/3×2×2×25×19 = 3/50