Réponses

2012-11-11T19:19:58+01:00

Bonsoir

1) MN = 200-2x

Aire de MNPQ = x(200-2x)= 200x-2x² = -2x²+200

2) Aire totale  = 18 400 m²

Aire espace vert = 13450 m²

Aire totale _ Aire pelouse  = Aire salle

a)

18400 - 13450 = 200x-2x²    

4950 = 200x-2x²

b) -2x²+200x-4950 = 0

delta = b²-4ac = 40 000  - 39600 = 400 alors  Vdelta = 20

solutions  (-b-Vdelta)/ 2a = 45

(-b+Vdelta)/2a = 55