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Kiinder
@Kiinder
January 2021
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Bonjour svp aidez moi :
Trois élèves ont effectué des développements.
Amélie : (2x + 3) (x + 3) = 3x + 6
Farid : (3x - 2) (2x - 1) = 6x2 + 2
Jennifer : (4x - 3) (x + 3) = 4x2 + 9x -9
1) Tester chacun de ces développements lorsque :
a) x = 0 b) x = 1 c) x = - 1
2) Quels sont les deux développements dont est certain qu'ils soient faux ? Pourquoi ? Développer alors correctement ces deux expressions.
3) Est - on certain que le troisième développement soit exact ? Si non, prouver son exactitude.
Merci de m'aider ! :)
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