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Charlottez17
@Charlottez17
May 2019
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Bonjour,j'ai un exercice qui me pose un problème le voici:
Mettre les expressions suivantes sous la forme : a+b racine carrée 5:
(2+ racine carée 5)puissance 2
(2+3 racine carée 5) puissance 2
Merci d'avance.
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Commentaires (1)
(2+√5)² = 2² + 2(2)(√5) + (√5)²
= 4 + 4√5 + 5
= 9 + 4√5
(2+3√5)² = 2² + 2(2)(3√5) + (3√5)²
= 4 + 12√5 + 9×5
= 49 + 12√5
2 votes
Thanks 1
charlottez17
merci
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= 4 + 4√5 + 5
= 9 + 4√5
(2+3√5)² = 2² + 2(2)(3√5) + (3√5)²
= 4 + 12√5 + 9×5
= 49 + 12√5