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Meilleure réponse !
2012-11-14T10:35:50+01:00

A = 1 *3/2*7 = 3/14

B = 6*3/7*9 = 18/56 = 9/28

c = 6*7/4*7 = 42/28 = 21/14

d = 4*5/2*25 = 20/50 = 2/5