Réponse :
bonjour,
A = 2x ( 3x + 2 ) ( 3x - 1 ) = 0
2x = 0
x = 0
ou 3x + 2 = 0
3x = - 2
x = -2/3
ou 3x - 1 = 0
3x = 1
x = 1/3
F = 4 ( 2+3 ) - (x - 5 ) = 0
( 8 + 12 ) - ( x - 5 ) = 0
8 + 12 - x +5 = 0
25 - x = 0
-x = -25
x = 25
B= 4( 2 +3x ) ( x - 5 ) = 0
(8 + 12x ) ( x - 5 ) = 0
8 + 12x = 0
12x = -8
x = -8/12
x = - 2/3
ou x - 5 = 0
x = 5
voila:)