Bonjour,
1. (x) = 3
x= 3
2. 1X - 81 = 2
x= 2+81
x= 83
3. 1-2x + 5 = 4
1+5-4 = 2x
2 = 2x
x= 2/2
x= 1
Réponse :
Bonjour,
1. (x) = 3
x=3
2. 1X - 81 = 2
x = 2 + 81
x = 83
3. 1-2x + 5 = 4
-2x + 6 = 4
-2x = 4 -6
-2x = -2
x = [tex]\frac{-2}{-2}[/tex]
x = 1
Rappel:
+ + = +
- - = +
+ - = -
- + = -