Mathématiques

Question

7+x=2,5 B) 3x+9=2x c)3-3(2x-7)=5x-(3-5x)

2 Réponse

  • 7+x=2,5
    x=4,5

    3x+9=2x
    x=-9

    3-3(2x-7)=5x-(3-5x)
    -6x+24=10x-3
    -16x=-27
    x=27/16
  • 7 + x = 2,5
    x = 2,5 - 7
    x = - 4,5

    3x + 9 = 2x
    3x - 2x = - 9
    x = - 9

    3 - 3 (2x - 7) = 5x - (3 - 5x)
    3 - 6x + 21 = 5x - 3 + 5x
    - 6x - 5x - 5x = - 3 - 3 - 21
    - 16x = - 27
    x = - 27 / (- 16) 
    x = 27/16

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