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Margaux59460
@Margaux59460
January 2021
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Salut,J'espère que vous pourrais m'aider ça serais gentil Merci beaucoup,J'ai vraiment besoin d'aide Merci d'avance
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aymanemaysae
Bonjour ;
La première ligne :
A = a² = 25 ; B = b² = 9 ; D = ab = - 15 ; E = bc = 12 .
La deuxième ligne :
b = D/a = - 14/7 = - 2 ;
A = a² = 49 ; B = b² = 4 ; D = ab = - 14 ; E = bc = 16 .
La troisième ligne :
On a : B = b² = 9 ≠ 0 , donc : b ≠ 0 ;
et comme EC = bc = 0 ;
donc : c = 0 .
On a : B = b² = 9 , donc b = 3 ou - 3 .
On a : a = D/b = 12/b ;
si b = 3 on a : a = 4 ;
et si b = - 3 on a : a = - 4 .
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La première ligne :
A = a² = 25 ; B = b² = 9 ; D = ab = - 15 ; E = bc = 12 .
La deuxième ligne :
b = D/a = - 14/7 = - 2 ;
A = a² = 49 ; B = b² = 4 ; D = ab = - 14 ; E = bc = 16 .
La troisième ligne :
On a : B = b² = 9 ≠ 0 , donc : b ≠ 0 ;
et comme EC = bc = 0 ;
donc : c = 0 .
On a : B = b² = 9 , donc b = 3 ou - 3 .
On a : a = D/b = 12/b ;
si b = 3 on a : a = 4 ;
et si b = - 3 on a : a = - 4 .