January 2021 0 60 Report
Bonjour, Voici un exercice, j'aimerai savoir si c'est juste.

Dans le plan muni d'un repère (O;i,j)vecteurs, on donne les point suivants: A(-4,1) B(2,4)
Recherchez la coordonnée du point C si vect. AC = 4/5vec.AB

Comp vec.AC = (x,y)-(-4,1) = (x+4),y-1)
Comp vec. AB = (2,4)-(-4,1) = (6-4,4-1)
vec AB = (6,3)

4/5vec.AB = 4/5(6,3) = (24/5, 12/5)

Donc (24/5,12/5) = (x+4, y-1)

x+4= 24/5 <=> x=24/5-4 <=>= 4/5
y-1=12/5<=> y=12/5 +1 <=>17/5

C= (4/5,17/5)

Merci
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