Mathématiques

Question

Résoudre les équation suivantes
A. 2-(3-4x)=2(3- 4X)
B. 7(2x-5)-3x =4+(8x+1)
C.4-(3x-5)=-4(3x-2)

2 Réponse

  • A. 2-(3-4x)=2(3- 4X)

    2-3x+4x = 6-8x

    x +8x = 6-2

    9x = 4

    x = 4/9


     B. 7(2x-5)-3x =4+(8x+1)

    14x-35 -3x = 4+8x+1

    11x -8x = 5+35

    3x = 40

    x = 40/3


     C.4-(3x-5)=-4(3x-2)

    4-3x+5 = -12x+8

    -3x+12x = 8-9

    9x = -1

    x = -1/9

  • A) 2-(3-4x)= 2(3-4x)
    -6 +8x= 6 -8x
    -6 +8x +6 +8x= 6 -8x +6 +8x
    16x= 12
    16x/16= 12/16
    x= 3/4

    B) 7(2x-5)-3x= 4+(8x+1)
    14x -35 -3x= 32x +4
    11x -35= 32x +4
    11x -35 +35 -32x= 32x +4 +35 -32x
    -21x= 39
    -21x/-21= 39/-21
    -x= -13/7
    x= 13/7

    C) 4-(3x-5)= -4(3x-2)
    -12x +20= -12x +8
    -12x +20 -20 +12x= -12x +8 -20 +12x
    x= -12


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