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Sagot :

LOJOY1A

Explications étape par étape:

2 x = 4 - 2

2 x= 2

x = 1

- 7 x + 4 = 3

- 7 x = 3 - 4

- 7 x = - 1

x = 1 / 7

x = 0,14

3 / x = - 8

3 = - 8 x

- 8 x = 3

x = - 3 / 8

x = 0,3

5 - 3 x = - 15

- 3 x = - 15 - 5

- 3 x = - 20

x = 20 / 3

x = 6,66

x - 9 = 12 x

x - 12 x = 9

- 11 x = 9

x = - 9 / 11

x = - 0,81

x / 9 = 3

x = 9 x 3

x = 27

MAUDMARINE

Bonjour,

a. 2 + 2x = 4

2x = 4 - 2

2x = 2

x = 2/2

x = 1

b. - 7x + 4 = 3

- 7x = 3 - 4

- 7x = - 1

x = 1/7

d. 5 - 3x = - 15

- 3x = - 15 - 5

- 3x = - 20

x = 20/3

e. x - 9 = 12x

x - 12x = 9

- 11x = 9

x = - 9/11

f. x/9 = 3

x = 3 * 9

x = 27

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