Réponses

2013-02-23T11:29:18+01:00

a) Aire(AMQ) = 3(4-3)/2 = 3/2
Aire(BMN) = 3(6-3)/2 = 9/2
Aire(MNPQ) = 24 - 9/2 - 3/2 = 18

b) Aire(AMQ) = x(4-x)/2
Aire(BMN) = x(6-x)/2
c) Aire(MNPQ) = 24 - x(4-x) - x(6-x)
f(x) = 2x² - 10x + 24
d) f(x) = 13.5
2x²-10x+10.5=0
f(0)=24 ; f(0.5)=19.5 ; f(1)=16 ; f(2)=12 ; f(2.5)=11.5 ; f(3)=12 ; f(3.5)=13.5 ; f(4)=16