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C21 Arrivé au stade des opérations concrètes (7-8 ans à 11-12 ans), l'enfant acquiert le second invariant psychique qu'est la conservation, qu'il peut argumenter par :a. La réversibilité par la négationb. L'identité de l'objet avec lui-mêmec. La compensationd. La logique formellee. e. Le raisonnement expérimental
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