Réponse :
bonsoir
4/10 = (2×2) / (2×5) = 2/5
15/20 = (5×3) / (5×4) = 3/5
20/40= (1×20) / (2×20) = 1/2
130/260 = (13×10) / (13×2×10) = 1/2
voila :)
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Réponse :
bonsoir
4/10 = (2×2) / (2×5) = 2/5
15/20 = (5×3) / (5×4) = 3/5
20/40= (1×20) / (2×20) = 1/2
130/260 = (13×10) / (13×2×10) = 1/2
voila :)