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Sarah737
@Sarah737
April 2019
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Bonsoir aidez moi pour l'exercice 2 svp
merci
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slyz007
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Exo2
AB-DA+2BC=AB+AD+2BC
BC=BA+AC donc
AB-DA+2BC=AB+AD+2(BA+AC)
AB-DA+2BC=AB+AD+2BA+2AC
AB-DA+2BC=AB+AD+BA+BA+2AC
AB-DA+2BC=BA+AB+BA+AD+2AC
Or BA+AB=0 et BA+AD=BD donc
AB-DA+2BC=BD+2AC
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Qu'elqu'un pour m'expliquer l'exercice 2 ? j'ai vraiment du mal svp
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Bonsoir, pouvez vous m'aidez pour l'exercice 1 et 2 ? Surtout le 2 svp
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Bonjour,quelqu'un peut m'aider ?
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Verified answer
Exo2AB-DA+2BC=AB+AD+2BC
BC=BA+AC donc
AB-DA+2BC=AB+AD+2(BA+AC)
AB-DA+2BC=AB+AD+2BA+2AC
AB-DA+2BC=AB+AD+BA+BA+2AC
AB-DA+2BC=BA+AB+BA+AD+2AC
Or BA+AB=0 et BA+AD=BD donc
AB-DA+2BC=BD+2AC