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January 2021
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Je veux montrer que x-y et x+y ont le même parité
merci de ne pas supprimer cette question, qui est une vraie question:
réponse
supposons x+y pair
donc x+y=2a
donc x=2a-y
donc x-y=2a-y-y=2a-2y=2(a-y) donc x-y est pair.
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