Mathématiques

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

2 Réponse

  • 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
  • 5x=54-9
    5x=45
    x=45/5
    x=9

    22x+12=-54
    22x=-54-12
    22x=-68
    x=-68/22
    x=-3.10

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