CHRYSTELLEMRLS
Answered

Bonjour aidez moi svp !!! : a)12+x=5-13x 7x-8=3x+2 b)5-12x+13,5=-x +12+3x-7,5 C) x/5+11=-9 5-x/2=1/2. D) 11/5 x +2=0 11=5+3/2x E) 3x/2 + x/3-1=1/3 3/2 x +1 = x/4-1. F) 3x+7(8-x)+4=60+x G) 5(x-2) + 2 (1-3x) =7x+12 H) 4(x-1)-3(2-x)=2

Sagot :

MAUDMARINE

Bonsoir,

a) 12 + x = 5 - 13x

x + 13x = 5 - 12

14x = - 7

x = - 7/14

x = - 1/2

7x - 8 = 3x + 2

7x - 3x = 2 + 8

4x = 10

x = 10/4

x = 5/2

b) 5 - 12x + 13,5 = - x + 12 + 3x - 7,5

- 12x + x - 3x = 12 - 7,5 - 5 - 13,5

- 14x = - 13,5

x = 13,5/14

C) x/5 + 11 = - 9

x/5 = - 9 - 11

x/5 = - 20

x/5 = - 100/5

x = - 100

5 - x/2 = 1/2.

- x/2 = 1/2 - 5

- x/2 = 1/2 - 10/2

- x = 1 - 10

- x = - 9

x = 9

D) 11/5x + 2 = 0

11/5x = - 2

11/5x = - 10/5

11x = - 10

x = - 10/11

11 = 5 + 3/2x

3/2x = 11 - 5

3/2x = 6

3/2x = 12/2

3x = 12

x = 12/3

x = 4

E) 3x/2 + x/3 - 1 = 1/3

9x/6 + 2x/6 = 2/6 + 6/6

9x + 2x = 2 + 6

11x = 8

x = 8/11

3/2x + 1 = x/4 - 1

3/2x - x/4 = - 1 - 1

6/4x - x/4 = - 4/4 - 4/4

6x - x = - 8

5x = - 8

x = - 8/5

F) 3x + 7 (8 - x) + 4 = 60 + x

3x + 56 - 7x + 4 = 60 + x

3x - 7x - x = 60 - 56 - 4

- 5x = 0

x = 0

G) 5 (x - 2) + 2 (1 - 3x) = 7x + 12

5x - 10 + 2 - 6x = 7x + 12

5x - 6x - 7x = 12 + 10 - 2

- 8x = 20

x = - 20/8

x = - 5/2

H) 4 (x - 1) - 3 (2 - x) = 2

4x - 4 - 6 + 3x = 2

4x + 3x = 2 + 4 + 6

7x = 12

x = 12/7.