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2013-12-16T19:07:35+01:00
A = (7/9 - 1/9) x 3/2 = 6/9 x 3/2 = 18/18 = 1
                         ou
A = 7/9 - (1/9 x 3/2) = 7/9 - 3/18 = 11/18
                                                                        Tout dépend de comment l'exercice est proposé !?!