Répondre :
1) x varie entre 0 et 4
2) si x = 1 :Aire CBED = (3+4)/2.3 = 10,5cm² Aire ABE = 1/2.1.3 = 1,5cm²
si x = 3 :Aire CBED = (1+4)/2.3 = 7,5cm² Aire ABE = 1/2.3.3 = 4,5cm²
3) Aire CBED = (4-x)/2.3 et aire ABE = 1/2.x.3
2) si x = 1 :Aire CBED = (3+4)/2.3 = 10,5cm² Aire ABE = 1/2.1.3 = 1,5cm²
si x = 3 :Aire CBED = (1+4)/2.3 = 7,5cm² Aire ABE = 1/2.3.3 = 4,5cm²
3) Aire CBED = (4-x)/2.3 et aire ABE = 1/2.x.3