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Sagot :

selon la relation de Charles,
1. AB + BN = AN
2. MQ + DB = MQ+ QP = MP
3. AB + AD + CB + CD = AB + BC + CB + BA = AC + CA = ?
4. MA + DC = MA + AB = MB
5. CP + BA = QC + CD = QD
6. 2NB + CD = ?

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