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Correction de l'exercice 1. 1. 0. (C3 Ð C3 ´ C2 ` C1). 2. 0. (C3 Ð C3 ` 2C1). 3. apd ´ cqpc ´ bqpb ´ aq. (C4 Ð C4 ´ C3).