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            <video:description>Pour simplifier des expressions avec des puissances, il existe des règles de calculs sur les puissances à connaître : a puissance n fois a puissance p est égal à a   puissance n+p,  a puissance n fois b puissance n est égal au produit ab puissance n et a puissance n puissance p est égal à a puissance n fois p.</video:description>
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