Mathématiques

Question

Résoudre les équations suivates :

1) 3x-7=5
2) 4(2x-3) = 6
3) 5x sur 3 =10
4) 2x +11 =4 -5x
5) 7(3x - 1) - 5(x+5) =0

Aidez moi vite merci 15 points à la clef

2 Réponse

  • 1) 3x-7=5
    3x = 5+7
    3x =12
    x =12/3
    x =4

    2) 4(2x-3) = 6
    8x -12 = 6
    8x = 6+12
    8x = 18
    x = 18/8
    x = 9/4

    3) 5x sur 3 =10
    5/3x = 10
    x = 10 x5/3
    x = 50/3

    4) 2x +11 =4 -5x
    2x +5x = 4 -11
    7x= -7
    x = -7/7
    x =-1

    5) 7(3x - 1) - 5(x+5) =0
    21x-7-5x-25 =0
    16x -32 =0
    16x = 32
    x = 32/16
    x = 2


  • Résoudre les équations suivantes :

    1)
    3x - 7 = 5
    3x = 5 + 7
    3x = 12
    x = 12/3
    x = 4

    2)
    4 (2x - 3) = 6
    8x -12 = 6
    8x = 6 +12
    8x = 18
    x = 18/8
    x = 2,25

    3)
    5/3x = 10
    5/3x = 30/3
    5x = 30
    x = 30/5
    x = 6

    4)
    2x + 11 = 4 - 5x
    2x + 5x = 4 - 11
    7x = - 7
    x = - 7/7
    x = - 1

    5)
    7(3x - 1) - 5(x + 5) = 0
    21x - 7 - 5x - 25 = 0
    16x - 32 = 0
    16x = 32
    x = 32/16
    x = 2


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