Or g) 5x - 8 = -10 - ég h) -5 - 7x = -3- 4x 3(2x + 4) = 5 -X j) (3x + 1) + ( 5x - 2) = 5 k) (8x + 7)-( 17x- 9) = 1 aider moi svp je n’y arrive pas

Réponse :

bonjour

5 x - 8 = - 10

5 x = - 10 + 8

5 x = - 2

x = - 2 /5

- 5 - 7 x = - 3 - 4 x

- 7 x + 4 x = - 3 + 5

- 3 x = 2

x = - 2 /3

6 x + 12 = 5 - x

6 x + x = 5 - 12

7 x = - 7

x = - 1

3 x + 1 + 5 x - 2 = 5

8 x = 5 - 1 + 2

8 x = 6

x = 6/8 = 3 /4

8 x + 7 - 17 x + 9 =  1

- 9 x = 1 - 7 - 9

- 9 x = - 15

x = 15/9 = 5/3

Explications étape par étape :

Bonjour,

g) 5x - 8 = -10

5x= -10 +8

5x= -2

x= -2/5

h) -5 - 7x = -3- 4x

-5+3 = -4x +7x

-2 = 3x

x = -2/3

3(2x + 4) = 5 -x

6x+ 12 =  5-x

6x +x = 5 -12

7x = -7

x= -7/7

x= -1

j) (3x + 1) + ( 5x - 2) = 5

3x+1 +5x -2 = 5

3x+5x = 5 -1+2

8x = 6

x= 6/8 = 3/4

k) (8x + 7)-( 17x- 9) = 1

8x +7 -17x +9 =1

7+9 -1 = 17x -8x

15 =9x

x = 15/9 = 5/3