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Sagot :

3 x vec AB + 3 x vec BD = 3 x (AB+BD) = 3 x vect AD

5 x vec RS - 5 vec QS = 5 x vect RS + 5 x vect SQ = 5 x vec RQ

7 x vec AB - 7 x vec AC = 7 x (AB - AC) = 7 x (AB + CA) = 7 x (CA+AB) = 7AB

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