bonjour
devoir niveau 5 ème et pas lycée
AB = 3 x
CD = 3 x + 12
EF = ( 4 + x ) / 3
GH = 40 - 3 x
x = 10
AB = 30
CD = 42
EF = 14/3
GH = 40 - 30 = 10
x = 2/3
AB = 6/3 = 2
CD = 6/3 + 12 = 14
EF = ( 4 + 2/3) : 3 = 14/3 x 1/3 = 14/9
GH = 40 - 6/3 = 40 - 2 = 38
