Réponse:
AM=9cm
BM=20:2=10cm
BD=10cm
AR=9cm
ER=9x2=18cm
BE=10+9=19cm
BR=12-9=3cm
AD=12-10=2cm
DR=12-2-3=7cm
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Réponse:
AM=9cm
BM=20:2=10cm
BD=10cm
AR=9cm
ER=9x2=18cm
BE=10+9=19cm
BR=12-9=3cm
AD=12-10=2cm
DR=12-2-3=7cm