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Madzirigolo
@Madzirigolo
April 2019
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Racine carrée niveau 3ème.
Je dois résoudre (4 - 5√6) (4 + 5√6)
Résultat sous la forme d'un nombre entier.
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Omnes
Salut,
On connait l'identité remarquable : (a-b)(a+b) = a² - b²
Ici, on a : a = 4 et b = 5√6
Donc on peut écrire :
(4 - 5√6) (4 + 5√6) = 4² - ( 5√6)² = 16 - 25*6 = 16 - 150 = -134
Bonne journée !
1 votes
Thanks 2
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Lista de comentários
On connait l'identité remarquable : (a-b)(a+b) = a² - b²
Ici, on a : a = 4 et b = 5√6
Donc on peut écrire :
(4 - 5√6) (4 + 5√6) = 4² - ( 5√6)² = 16 - 25*6 = 16 - 150 = -134
Bonne journée !