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2013-11-03T11:41:20+01:00
A. AB/AC = AD/AE = BD/CE
10/9/56/9 = 3/AE = BD/ 28/5
10/9/56/9 = BD/ 28/5
BD = 10/9 x 28/5 / 56/9
BD = 1 cm

AB/AC = AD/AE = BD/CE
10/9/56/9 = 3/AE = BD/ 28/5
10/9/56/9 = 3/AE
AE = 3 x 56/9 / 10/9
AE = 16,8 cm

DE = AE - AD
DE = 16,8 - 3
DE = 13,8 cm
AB = 3³ = 27 mm
AC = 3 puissance 5 = 242 mm
AD = 3 puissance 4 = 81 mm
EC = 3³ = 27 mm

AB/AC = AD/AE = BD/CE
27/242 = 81/AE = BD/27
27/242 = 81/AE
AE = 242 x 81 / 27
AE = 726 mm

AB/AC = AD/AE = BD/CE
27/242 = 81/AE = BD/27
27/242 = BD/27
BD = 27x27/ 242
BD = 31 mm

DE = AE-AD
DE = 726 - 81
DE = 645 mm
le dernier commentaire c'est le B?
oui
Merci bien :)
De rien :D