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bonjour
AB = 17/10 cm
BC = 17/10 - 1 /3 = 51/30 - 10/30 = 41/30
CM = 41/30 - 11 /20 = 82 /60 - 33 /60 = 49/60
périmètre = 17/10 + 41/30 + 49/60
= 102/60 + 82 /60 + 49/60
= 233/60 cm
bonjour
AB = 17/10 cm
BC = 17/10 - 1 /3 = 51/30 - 10/30 = 41/30
CM = 41/30 - 11 /20 = 82 /60 - 33 /60 = 49/60
périmètre = 17/10 + 41/30 + 49/60
= 102/60 + 82 /60 + 49/60
= 233/60 cm