Exercice 1 : Résoudre les équations suivantes : a) 5x - 11 = 1 b) 16x - 5 = 9 c) 6,5 – 3,3x = 4,7x + 9,5 d) 3x - 5 - x + 6 = 5x + 3 e) 7(x - 2) + x - 8 = 3

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Résoudre les équations suivantes :

a) 5x - 11 = 1

5x = 1 + 11

5x = 12

x = 12/5

b) 16x - 5 = 9

16x = 9 + 5

16x = 14

x = 14/16

x = 7/8

c) 6,5 – 3,3x = 4,7x + 9,5

- 3,3x - 4,7x = 9,5 - 6,5

- 8x = 3

x = - 3/8

d) 3x - 5 - x + 6 = 5x + 3

3x - x - 5x = 3 + 5 - 6

- 3x = 2

x = - 2/3

e) 7(x - 2) + x - 8 = 3r_4 --> Erreur d'expression

f) 9(x + 4) - 6(3 - x) = 5x – 8

9x + 36 - 18 + 6x = 5x - 8

9x + 6x - 5x = - 8 - 36 + 18

10x = - 26

x = - 26/10

x = - 14/5

g) 5(2x + 3) - (4x + 7) = 8 – 5x

10x + 15 - 4x - 7 = 8 - 5x

10x - x + 5x = 8 - 15 + 7

14x = 0

x = 0.