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fanfan56
@fanfan56
January 2021
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Bonjour,
Dans le plan muni du repère (O,i,j), on donne les points suivants: A(2,1), B(5,8), C(7,2) et D(8,y).
Calculez y si les droites AB et CD sont parallèles.
J'ai calculé les composantes:
vec AB=(5,8)-(2,1) = (5-2,8-1) = (3,7)
vec CD = (8,y) - (2,1) = (8-7 , y-2) = (1, y-2)
J'aimerai juste savoir si vec CD est juste.
merci
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