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cornetcamille1
@cornetcamille1
June 2021
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Voilà donc il faut faire comme le modèle. Merci d'avance :)
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MatM
(√5 -1)(2 + 3√5) = 2 x √5 + 3 x √5 x√5 - 1 x 2 - 1 x 3√5
= 2√5 + 3 x 5 - 2 - 3√5
= (2 - 3)√5 + 15 - 2
= (-1)√5 + 13
= -√5 + 13
(√2 + √3)² = (√2)² + 2 x √2 x√3 + (√3)²
= 2 + 2√6 + 3
= 5 + 2√6
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= 2√5 + 3 x 5 - 2 - 3√5
= (2 - 3)√5 + 15 - 2
= (-1)√5 + 13
= -√5 + 13
(√2 + √3)² = (√2)² + 2 x √2 x√3 + (√3)²
= 2 + 2√6 + 3
= 5 + 2√6