9/25 = (9×4)/(25×4) = 36/100
7/20 = (7×5)/(20×5) = 35/100
36/100 > 35/100 donc 9/25 > 7/20
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9/25 = (9×4)/(25×4) = 36/100
7/20 = (7×5)/(20×5) = 35/100
36/100 > 35/100 donc 9/25 > 7/20