bonjour
Alix = x
benoît = x + 4
Mohamed= 2 ( x + 4 ) = 2 x + 8
x + x + 4 + 2 x + 8 = 20
4 x = 20 - 12
4 x = 8
x = 2
Alix a eu 2 , Benoît 6 et Mohamed 12
M est le milieu de AD donc AM = MD = 2 cm
Aire ABCD = 4 ² = 16 cm²
Aire MDC = ( 2 x 4 ) / 2 = 4 cm²
Aire ABCM = 16 - 4 = 12 cm²
DM = x
valeurs ] 0 : 4 [
aire CDM = 4 x /2 = 2 x
aire ABCM = 16 - 2 x
aire totale - aire triangle
16 - 2 x = 4
- 2 x = 4 - 16
- 2 x = - 12
x = 6
bon dimanche
