Réponse :
B = (3a-2)(4-2a) = 12a - 6a² - 8 + 4a = -6a²+ 16a - 8
*a=4/3
B = -6(4/3)² + 16(4/3) - 8 = -6(16/9) + 64/9 - 8 = -96/9 + 64/9 - 8 = -32/9 - 8 = - 32/9 - 72/9 = -102/9 = (-34/3
EXERCICE 2
1)
a) (1) : 1 + (-12) = - 11 - 2 = - 13 + (1 - 1) = -13
b. (-1) : (-1) + (-12) = - 13 - 2 = - 15 + (-1 - 1) = -17
2) (x - 11 - 2) + (x -1) = x - 11 - 2 + x - 1 = 2x - 14 2x = 14 x=14/2=7
VERIF. : 7 - 11 - 2 + 7 - 1 = 0
EXERCICE3
3) f(x) = 3/5x
*f(0) : 3
*f(1) : 3/5
*f(2) : 3/10
*f(3) : 3/15 = 1/5
*f(4) : 3/20
*f(5) : 3/25
Explications étape par étape :
