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Priscoune
@Priscoune
June 2021
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bonjour,pouvez m'aider??
merci beaucouppp
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slyz007
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A) AB-CD-(AC-BA)=AB+DC+CA+BA
AB+BA=0 et DC+CA=DA donc :
AB-CD-(AC-BA)=DA
b)
AD+BC=AC+CD+BD+DC=AC+BD+CD+DC=AC+BD
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Priscoune
merci
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Verified answer
A) AB-CD-(AC-BA)=AB+DC+CA+BAAB+BA=0 et DC+CA=DA donc :
AB-CD-(AC-BA)=DA
b)
AD+BC=AC+CD+BD+DC=AC+BD+CD+DC=AC+BD