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Jkiatoko
@Jkiatoko
April 2019
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Vecteurs u(-3;4) et v(z;7)
déterminer le réel ztel que u et v soient colinéaires
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senmusa
Il faut que vect(u) = k*vect(v)
-3=k*z et 4=k*7 <==> k=4/7
D'où;
-3=(4/7)z <==> z= -21/4
Vérification:
u = (-3; 4) = v = (-21/4 ; 7) <==> (-3 ; 4) = (7/4)(-3 ; 4)
1 votes
Thanks 1
Hauwk
X'y-y'x=0
-3x7-4xz=0
-21-4xz=0
-4xZ=21
Z=-21/4
Z=-5.25
1 votes
Thanks 1
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Lista de comentários
-3=k*z et 4=k*7 <==> k=4/7
D'où;
-3=(4/7)z <==> z= -21/4
Vérification:
u = (-3; 4) = v = (-21/4 ; 7) <==> (-3 ; 4) = (7/4)(-3 ; 4)
-3x7-4xz=0
-21-4xz=0
-4xZ=21
Z=-21/4
Z=-5.25