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GABRIELLEGUIMARAES30
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Bonjour, voici un exercice de math, je vous met aussi la pièce jointe.

Exercice 9:
Résoudre les équations suivantes : 3x + 3 = 15 ; − 3 + 5x = 12 ; 6x + 2 = 2x + 12 ; 3(7x + 12) = 41 ; − 3x + 7 = 4x – 12 ; 2x − 4 = 3 − 5x ; 3(2x − 1) = 2 + (x − 3).

Merci de m'aider s'il vous plaît

Sagot :

VINS

bonjour

3 x + 3 = 15

3 x = 15 - 3

3 x = 12

x = 4

- 3 + 5 x = 12

5 x = 12 + 3

5 x = 15

x = 3

6 x + 2 = 2 x + 12

6 x - 2 x = 12 - 2

4 x = 10

x = 10/4 = 5 /2

21 x + 36 = 41

21 x = 41 - 36

21 x  =  5

x =  5/21

- 3 x + 7 =  4 x - 12

- 3 x - 4 x = - 12 - 7

-  7 x = - 1 9

x = 19/7

2 x - 4 = 3 - 5 x

2 x + 5 x = 3 + 4

7 x =  7

x = 1

6 x - 3 = 2 + x - 3

6 x - x = 2 - 3 + 3

5 x =  2

x = 2 /5

MAUDMARINE

Bonsoir,

Exercice 9:

Résoudre les équations suivantes :

3x + 3 = 15

3x = 15 - 3

3x = 12

x = 12/3

x = 4

− 3 + 5x = 12

5x = 12 + 3

5x = 15

x = 15/5

x = 3

6x + 2 = 2x + 12

6x - 2x = 12 - 2

4x = 10

x = 10/4

x = 5/2

3(7x + 12) = 41

21x + 36 = 41

21x = 41 - 36

21x = 5

x = 5/21

− 3x + 7 = 4x – 12

- 3x - 4x = - 12 - 7

- 7x = - 19

x = 19/7

2x − 4 = 3 − 5x

2x + 5x = 3 + 4

7x = 7

x = 7/7

x = 1

3(2x − 1) = 2 + (x − 3).

6x - 3 = 2 + x - 3

6x - x = 2 - 3 + 3

5x = 2

x = 2/5.

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