Bonjour,j'ai besoin d'aide pour mon dm de maths (niveau 4eme)s'il vous plait( vous trouverais ci-joint les 2 exo .)
48) 4x + 5= 3x - 2
4x -3x = -2 -5
x = - 7
5x - 3 = 7x +9
5x - 7x = 9 +3
- 2x = 12
x = -12/2 = -6
7x - 6 = 3x +7
7x -3x = 7 +6
4x = 13
x= 13/4
12x - 7 =15x +2
12x - 15x = 2+7
- 3x = 9
x= -9/3 = -3
49) 7x -8 = 3x +6
7x -3x = 6 +8
4x = 14
x = 14/4 = 7/2 .
3x -2 = 5x +3
3x - 5x = 3+2
- 2x = 5
x = -5/2
3x-5 = 8x-11
3x -8x = -11 +5
-5x = -6
x = 6/5
7x+7 =9x -3
7x -9x = -3 -7
-2x = -10
x = 10/2 = 5
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48) 4x + 5= 3x - 2
4x -3x = -2 -5
x = - 7
5x - 3 = 7x +9
5x - 7x = 9 +3
- 2x = 12
x = -12/2 = -6
7x - 6 = 3x +7
7x -3x = 7 +6
4x = 13
x= 13/4
12x - 7 =15x +2
12x - 15x = 2+7
- 3x = 9
x= -9/3 = -3
49) 7x -8 = 3x +6
7x -3x = 6 +8
4x = 14
x = 14/4 = 7/2 .
3x -2 = 5x +3
3x - 5x = 3+2
- 2x = 5
x = -5/2
3x-5 = 8x-11
3x -8x = -11 +5
-5x = -6
x = 6/5
7x+7 =9x -3
7x -9x = -3 -7
-2x = -10
x = 10/2 = 5