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Soient 3 points de l'espace A ( 1 ; 4 ; - 2 ) B ( 3 ; 0 ; 7 ) C ( - 1 ; 3 ; 1...
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Soient 3 points de l'espace
A(1;4;-2)B(3;0;7)C(-1;3;1)
A quoi est égal le produit scalaire AC→.AB→ ?
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