bonsoir
P : xy = 0
vrai si xy = 0 , x et y sont nuls
- 2 < x ≤ 3
x ∈ ] - 2 ; 3 ] vrai
5 - 2 x = 0
- 2 x = - 5
x = 5/2 = 2.5
- 2 x = - 3
x = 3/2 = 1.5
4 x + 2 = 3 x + 4
4 x - 3 x = 4 - 2
x = 2
6 x - 2 = 4 x + 4
6 x - 4 x = 4 + 2
2 x = 6
x = 6/2 = 3
4 x + 1 = 5
4 x = 5 - 1
4 x = 4
x = 1
2 x - 10 - 2 = 0
2 x = 10 + 2
2 x = 12
x = 6
2 x + 17 = - 1
2 x = - 1 - 17
2 x = - 18
x = - 9
3 x - 7 = 5
3 x = 5 + 7
3 x = 12
x = 4
continue , tu as assez d'exemples