LEAGEVERS
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Bonjour j’ai du mal à résoudre mes équations : a) 3x-2=13+17x
b) 2-(x-3)=6x
c) 4/5x -8=-1
d) 2.(x-4)+1=6x
e) 2/5 x -4=3
f) 2x+6=3x+9
Merci d’avance

Sagot :

MAUDMARINE

Bonsoir,

Résoudre ces équations :

a) 3x-2=13+17x

3x - 17x = 13 + 2

- 14x = 15

x = - 15/14

b) 2-(x-3)=6x

2 - x + 3 = 6x

- x - 6x = - 2 - 3

- 7x = - 5

x = 5/7

c) 4/5x -8=-1

4/5x = - 1 + 8

4/5x = - 5/5 + 40/5

4x = - 5 + 40

4x = 35

x = 35/4

d) 2.(x-4)+1=6x

2x - 8 + 1 = 6x

2x - 6x = 8 - 1

- 4x = 7

x = - 7/4

e) 2/5 x -4=3

2/5x = 3 + 4

2/5x = 7

2/5x = 35/5

2x = 35

x = 35/2

f) 2x+6=3x+9

2x - 3x = 9 - 6

- x = 3

x = - 3