exercice 1 a b c
Explications étape par étape:
2. a) X -3 = 0
X = 0 + 3
X = 3
b) 2X + 2 = 0
2X = 0 -2
2X = -2
X = 2/ -2
X = -1
c) X-4 = -2
X = -2 +4
X = 2
