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Lea1711
@Lea1711
May 2019
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Bonjour, quelqu’un peut m’aider pour la question 2? Niveau 1S décomposition de vecteur. Mercii
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scoladan
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Bonjour,
2)a)
RP = RA + AP
= - AR + AP
= 1/3AC + 1/4AB
RQ = RA + AQ
= -AR + AB + BQ
= 1/3AC + AB + 3/7(BA + AC)
= (1/3 + 3/7)AC + (1 - 3/7)AB
= 16/21AC + 12/21AB
b) 12 x RP = 4AC + 3AB
et 21 x RQ = 16AC + 12AB = 4 x RP
donc RQ = 4/21 x RP
⇒ RQ et RP sont colinéaires
⇒ R, P et Q sont alignés
1 votes
Thanks 1
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Quelqu'un pourrait m'aider? Mercii
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Bonjour, Quelqu'un pourrait m'aider, merciii
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Quelqu'un pourrait me dire si cela est juste ? Merci!
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Verified answer
Bonjour,2)a)
RP = RA + AP
= - AR + AP
= 1/3AC + 1/4AB
RQ = RA + AQ
= -AR + AB + BQ
= 1/3AC + AB + 3/7(BA + AC)
= (1/3 + 3/7)AC + (1 - 3/7)AB
= 16/21AC + 12/21AB
b) 12 x RP = 4AC + 3AB
et 21 x RQ = 16AC + 12AB = 4 x RP
donc RQ = 4/21 x RP
⇒ RQ et RP sont colinéaires
⇒ R, P et Q sont alignés