Mathématiques

Question

pourriez-vous m aider merci c est pour demain
resoudre chaque equations
a)5x-3=6-3x
b)7-4x=-3+2x
c)3(5-2x)=7-4x
d)3-(2x-4)=x+7
d)3(2x+7)-4=7-5(4-3x)
b)2x(3x-4)+5=3x(2x-5)-4

1 Réponse

  • A) 5x -3 = 6 -3x
        5x +3x = +3 +6
        8x = 9
        x = 9/8

    B = 7 -4x = -3 +2x 
    -4x -2x = -7 -3
    -6x = -10
    x = +10/6 = +5/3

    C = 3(5 -2x) = 7 -4x
    15 -6x = 7 -4x
    -6x +4x = -15 +7
    -2x = -8
    x = 8/2 = 4

    D = 
    3-(2x-4) = x+7
    3 -2x +4 = x +7
    -2x -x = -3 -4 +7
    -3x = 0

    E = 3(2x+7)-4 = 7-5(4-3x)
    6x +21 -4 = 7 -20 +15x
    6x -15x = -21 +4 +7 -20
    -9x = -30
    x = +30/9





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