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Jeremy26i
@Jeremy26i
April 2019
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Bonsoir ! Je galère galère sur cette exercice niveau 1ère S :
A, B, C et D sont quatre points du plan tels que :
(AB, AD) =
(AB, AE) =
(AD, AC) =
Démontrer que les points A, E et C sont alignés
Les mesures entre parenthèse sont des vecteurs, merci pour votre aide! (:
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slyz007
Verified answer
Bonjour,
(AB;AC)=(AB;AD)+(AD;AC)=3π/4-5π/12=π/3
(AE;AB)=-(AB;AE)=2π/3
(AE;AC)=(AE;AB)+(AB;AC)=π/3+2π/3=π
Donc A, E et C sont alignés
2 votes
Thanks 2
Jeremy26i
Merci beaucoup ! (:
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Verified answer
Bonjour,(AB;AC)=(AB;AD)+(AD;AC)=3π/4-5π/12=π/3
(AE;AB)=-(AB;AE)=2π/3
(AE;AC)=(AE;AB)+(AB;AC)=π/3+2π/3=π
Donc A, E et C sont alignés