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2013-04-09T17:40:23+02:00

N°33

a = x = 2-3      x = -1

b = x = 2+3     x = 5

c = 3x = 2        x = 2/3

d = x/3 = 6/3   x = 6

 

N)34

a = 2x = 1-3      2x = -2    x = -1

b = 2x = 1+3     2x = 4      x = 2

c = 2x+6 = 1      2x = 1-6   2x = -5      x = -5/2

d = 2x-6 = 1       2x = 1-7    2x = -6     x = -6/2 = -3

 

N°35

a = 6x -6 = 1      6x = 1+6     6x = 7     x = 7/6

b = 9x -6 = 4       9x = 4+6     9x = 10   x = 10/9

c = 2x +5 = 4       2x = 4-5      2x = -1    x = -1/2

d = 3x +28 = -56   3x = -56-28    3x = -84   x = - 28

 

tu fais pareil pour le 36

 

 

 

2013-04-09T17:44:25+02:00

EXERCICE 33 :

 

x + 3 = 2

x + 3 - 3 = 2 - 3

x = - 1

 

x - 3 = 2

x - 3 + 3 = 2 + 3

x = 5

 

3x / 3 = 2 / 3

x = 2 / 3

 

x / 3 = 2

x / 3  *3 = 2*3

x = 6

 

EXERCICE 34 :

 

2x + 3 = 1

2x + 3 - 3 = 1 - 3

2x / 2 = - 2 / 2

x = -1

 

2x - 3 = 1

2x - 3 + 3 = 1 + 3

2x / 2 = 4 / 2

x = 2

 

2(x + 3) = 1

2x + 6 = 1 

2x + 6 - 6 = 1 - 6

2x / 2 = -5 / 2

x = -5/2

 

2(x - 3) = 1

2x - 6 + 6 = 1 + 6

2x / 2 = 7 / 2

x = 7/2