resoudre les équations : 5x+9=54 22x+12=-54 109=29-8x 4x(3+2x)-9=-61 2x+16=6x-4 x-150=-9x+20 5x(x-3)+5=2x+11 204=-6x+132 6x-76=40-2x(2x+8) 42-12x=-14x-12
Mathématiques
maggybol
Question
resoudre les équations :
5x+9=54
22x+12=-54
109=29-8x
4x(3+2x)-9=-61
2x+16=6x-4
x-150=-9x+20
5x(x-3)+5=2x+11
204=-6x+132
6x-76=40-2x(2x+8)
42-12x=-14x-12
5x+9=54
22x+12=-54
109=29-8x
4x(3+2x)-9=-61
2x+16=6x-4
x-150=-9x+20
5x(x-3)+5=2x+11
204=-6x+132
6x-76=40-2x(2x+8)
42-12x=-14x-12
2 Réponse
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1. Réponse maudmarine
5x + 9 = 54
5x = 54 - 9
5x = 45
x = 45/5
x = 9
22x + 12 = - 54
22x = - 54 - 12
22x = - 66
x = - 66/22
x = - 3
109 = 29 - 8x
109 - 29 = - 8x
- 8x = 80
x = - 80/8
x = - 10
4x (3 + 2x) - 9 = - 61
12x + 8x - 9 = - 61
12x + 8x = - 61 + 9
20x = - 52
x = - 52/20
x = - 2,6
2x + 16 = 6x - 4
2x - 6x = - 4 - 16
- 4x = - 20
x = 20/4
x = 5
x - 150 = - 9x + 20
x + 9x = 20 + 150
10x = 170
x = 170/10
x = 17
5x (x - 3) + 5 = 2x + 11
5x - 15 + 5 = 2x + 11
5x - 2x = 11 + 15 - 5
3x = 21
x = 21/3
x = 7
204 = - 6x + 132
204 - 132 = - 6x
- 6x = 72
x = - 72/6
x = - 12
6x - 76 = 40 - 2x (2x + 8)
6x - 76 = 40 - 4x - 16
6x + 4x = 40 - 16 + 76
10x = 100
x = 100/10
x = 10
42 - 12x = - 14x - 12
- 12x + 14x = - 12 - 42
2x = - 56
x = - 56/2
x = - 28 -
2. Réponse rojolepape
5x=54-9
5x=45
x=45/5
x=9
22x+12=-54
22x=-54-12
22x=-68
x=-68/22
x=-3.10