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Exercice 4 Résoudre les équations suivantes
a. 3x - 7 = 23
b. 5x - 8 = -10
c. 4x - 7 = 2x + 13 d. 3(x-1) + 2(x + 3) = 0
e. 3x + 2+ 4(x + 1) = 3(x+2) -2(5x + 1)​


Répondre :

Bonsoir;

a. 3x - 7 = 23

3x= 23+7

3x = 30

x= 30/3

x = 10

b. 5x - 8 = -10

5x = -10+8

5x = -2

x = -2/5= -0,4

c. 4x - 7 = 2x + 13

4x-2x = 13+7

2x = 20

x= 20/2

x= 10

d. 3(x-1) + 2(x + 3) = 0

3x-3 +2x +6 = 0

5x = -6+3

5x = -3

x = -3/5

e. 3x + 2+ 4(x + 1) = 3(x+2) -2(5x + 1)​

3x +2 +4x +4 = 3x+6 -10x -2

3x+4x-3x +10x = 6-2 -2 -4

14x = -2

x= -2/14 = -1/7

a: 3x=23+7
3x=30
x=10
b:5x= -10+8
5x=-2
5x=-0,4
c:4x-2x=13+7
2x=20
x=10
d:3x-3+2x+6=0
5x+3=0
5x=-3
x=0,6
e:3x+2+4x+4=3x+6-10x-2
3x+4x+10x-3x=6-2-2-4
14x=-2
x=-1/7