Bonsoir, pouvez-vous m’aider •6-x=13 •4x-2=10 •5x+2=8x-3 •2(3b+7)=4(-2b+1) •6x-3=-2x+5 Merci

Réponse :

Bonsoir

Explications étape par étape

6 -x = 13

-x = -6 +13

-x = +7

x = -7

4x -2 = 10

4x = +2 +10

4x = 12

x = 12/4 = 3

5x +2 = 8x -3

5x -8x = -2 -3

-3x = -5

x = +5/3

2(3b+7) = 4(-2b+1)

6b +14 = -8b +4

6b +8b = -14 +4

14b = -10

b = -10/14 = -5/7

6x-3 = -2x+5

6x +2x = +3 +5

8x = 8

x = 8/8 = 1

Bonjour !

1)

6 - x = 13

6 - x + x = 13 + x

6 = 13 + x

13 + x - 13 = 6 - 13

x = -7

2)

4x - 2 = 10

4x - 2 + 2 = 10 + 2

4x = 12

4x/4 = 12/4

x = 3

3)

5x + 2 = 8x - 3

5x + 2 - 5x = 8x - 3 - 5x

2 = 3x - 3

3x - 3 + 3 = 2 + 3

3x = 5

3x/3 = 5/3

x = 5/3

4)

2(3b + 7) = 4(-2b + 1)

2*3b + 2*7 = 4*(-2b) + 4*1

6b + 14 = -8b + 4

6b + 14 + 8b = -8b + 4 + 8b

14b + 14 = 4

14b + 14 - 14 = 4 - 14

14b = -10

14b/14 = -10/14

b = -5/7

5)

6x - 3 = -2x + 5

6x - 3 + 2x = -2x + 5 + 2x

8x - 3 = 5

8x - 3 + 3 = 5 + 3

8x = 8

8x/8 = 8/8

x = 1

J'espère t'avoir aidé. Bon courage !