Mathématiques

Question

1. 4x+3-(x+1)+5=5x+7
2. 2x+1-(2+x)-7=3x+7
3. 5(x-1)+3(2-x)=0
4. 7(x+4)-3(x+1)=4(x-2)
5. 8(4-3x)+1=53-3(x-5)
6. 13x+2-(x-3)=x-5-3(x+12)+4x
7. 5(3x-1)-(1-2x)=3(5x-2)
8. (x+2)(x+1)=(x+4)(x-5)
aider moi svp c'est urgent merci d'avance c'est pour demain et c'est noter

1 Réponse

  • Bonjour,

    1. 4x+3-(x+1)+5=5x+7
    4x + 3 - x - 1 + 5 = 5x + 7
    4x - x - 5x = 7 - 3 + 1 - 5
    - 2x = 0
    x = 0

    2. 2x+1-(2+x)-7=3x+7
    2x + 1 - 2 - x - 7 = 3x + 7
    3x - x - 3x = 7 - 1 + 2
    - x = 8
    x = - 8

    3. 5(x-1)+3(2-x)=0
    5x - 5 + 6 - 3x = 0
    5x - 3x = 5 - 6
    2x = - 1
    x = - 1/2

    4. 7(x+4)-3(x+1)=4(x-2)
    7x + 28 - 3x - 3 = 4x - 8
    7x - 3x - 4x = - 8 - 28 + 3
    0x = Impossible

    5. 8(4-3x)+1=53-3(x-5)
    32 - 24x + 1 = 53 - 3x + 15
    - 24x + 3x = 53 + 15 - 32 - 1
    - 21x = 35
    x = - 35/21
    x = - 5/3

    6. 13x+2-(x-3)=x-5-3(x+12)+4x
    13x + 2 - x + 3 = x - 5 - 3x - 36 + 4x
    13x - x + 3x - 4x = - 5 - 36 - 2 + 3
    11x = - 40
    x = - 40/11

    7. 5(3x-1)-(1-2x)=3(5x-2)
    15x - 5 - 1 + 2x = 15x - 6
    15x - 15x + 2x = - 6 + 5 + 1
    2x = 0
    x = 0

    8. (x+2)(x+1)=(x+4)(x-5)
    x² + x + 2x + 2 = x² - 5x + 4x - 20
    x² - x² + x + 2x + 5x - 4x = - 20 - 2
    4x = - 22
    x = - 22/4
    x = - 11/2

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