Bonjour,
Résoudre équations :
a) 6x -5 = 3x+1
6x - 5 - 3x = 3x + 1 - 3x
3x - 5 = 1
3x - 5 + 5 = 1 + 5
3x = 6
3x/3 = 6/3
• x = 2
b) 7-4x=9-2x
7 - 4x + 4x = 9 - 2x + 4x
7 - 9 = 9 + 2x - 9
-2 = 2x
2x/2 = -2/2
• x = -1
c) 3x-4=8-7x
3x - 4 + 4 = 8 - 7x + 4
3x + 7x = 12 - 7x + 7x
10x = 12
10x/10 = 12/10
• x = 6/5
d) 5x-1=8x+11
5x - 1 - 5x = 8x + 11 - 5x
-1 - 11 = 3x + 11 - 11
-12 = 3x
3x/3 = -12/3
• x = -4
e) 6x-5=10x
6x - 5 - 6x = 10x - 6x
-5 = 4x
4x/4 = -5/4
• x = -5/4
f) (x+5) + (x-1)=0
x + 5 + x - 1 = 0
2x + 4 = 0
2x = -4
2x/2 = -4/2
• x = -2
g) (-x+8) -(x-1)=0
-x + 8 - x + 1 = 0
-2x + 9 = 0
-2x + 9 + 2x = 0 + 2x
9 = 2x
2x/2 = 9/2
• x = 9/2
6x -5 = 3x+1 = 6x -3x = +5 +1 = 3x = 6
x = 6/3 = 2
7-4x=9-2x = -4x +2x = -7 +9 = -2x = 2
x = -2/2 = -1 3x -4= 8-7x = 3x +7x = +4 +8 = 10x = 12
x = 12/10 = 6/5
5x -1 = 8x +11 = 5x -8x = 1 +11 = -3x = 12
x = -12/3 = -4
6x -5 = 10x = 6x -10x = +5 = -4x = 5
x = -5/4
(x+5) + (x-1) = 0
x +5 +x -1 = 0 2x + 4 = 0 2x = -4 2x/2 = -4/2 x = -2 (-x+8) -(x-1 )= 0 -x + 8 - x + 1 = 0 -2x + 9 = 0 -2x + 9 + 2x = 0 + 2x = 9 = 2x 2x/2 = 9/2
x= 4,5
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Bonjour,
Résoudre équations :
a) 6x -5 = 3x+1
6x - 5 - 3x = 3x + 1 - 3x
3x - 5 = 1
3x - 5 + 5 = 1 + 5
3x = 6
3x/3 = 6/3
• x = 2
b) 7-4x=9-2x
7 - 4x + 4x = 9 - 2x + 4x
7 - 9 = 9 + 2x - 9
-2 = 2x
2x/2 = -2/2
• x = -1
c) 3x-4=8-7x
3x - 4 + 4 = 8 - 7x + 4
3x + 7x = 12 - 7x + 7x
10x = 12
10x/10 = 12/10
• x = 6/5
d) 5x-1=8x+11
5x - 1 - 5x = 8x + 11 - 5x
-1 - 11 = 3x + 11 - 11
-12 = 3x
3x/3 = -12/3
• x = -4
e) 6x-5=10x
6x - 5 - 6x = 10x - 6x
-5 = 4x
4x/4 = -5/4
• x = -5/4
f) (x+5) + (x-1)=0
x + 5 + x - 1 = 0
2x + 4 = 0
2x = -4
2x/2 = -4/2
• x = -2
g) (-x+8) -(x-1)=0
-x + 8 - x + 1 = 0
-2x + 9 = 0
-2x + 9 + 2x = 0 + 2x
9 = 2x
2x/2 = 9/2
• x = 9/2
6x -5 = 3x+1 = 6x -3x = +5 +1 = 3x = 6
x = 6/3 = 2
7-4x=9-2x = -4x +2x = -7 +9 = -2x = 2
x = -2/2 = -1 3x -4= 8-7x = 3x +7x = +4 +8 = 10x = 12
x = 12/10 = 6/5
5x -1 = 8x +11 = 5x -8x = 1 +11 = -3x = 12
x = -12/3 = -4
6x -5 = 10x = 6x -10x = +5 = -4x = 5
x = -5/4
(x+5) + (x-1) = 0
x +5 +x -1 = 0 2x + 4 = 0 2x = -4 2x/2 = -4/2 x = -2 (-x+8) -(x-1 )= 0 -x + 8 - x + 1 = 0 -2x + 9 = 0 -2x + 9 + 2x = 0 + 2x = 9 = 2x 2x/2 = 9/2
x= 4,5