Réponse:
vect(DF) = 2,5 vect(DE)
xF-xD = 2,5(xE-xD)
yF-yD = 2,5(yE-yD)
xF = 2,5(xE-xD) + xD
= 2,5(-1+3) + (-3)
= 2,5×2 - 3
xF = 2
yF = 2,5(yE-yD) + yD
= 2,5(-1-5) + 5
= 2,5×(-6) + 5
yF = -10
D'où F(2; -10)
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Réponse:
vect(DF) = 2,5 vect(DE)
xF-xD = 2,5(xE-xD)
yF-yD = 2,5(yE-yD)
xF = 2,5(xE-xD) + xD
= 2,5(-1+3) + (-3)
= 2,5×2 - 3
xF = 2
yF = 2,5(yE-yD) + yD
= 2,5(-1-5) + 5
= 2,5×(-6) + 5
yF = -10
D'où F(2; -10)