Mathématiques

Question

3-(2a-3)=0
2a-(1+5a)=4a
1/2y-(3-y)=5-2y
2t-(4-1/2t)=-1
4x-1+2-x/5=x-3/10
1-3x+4-2x/8=9-7x/4
2/7-1/4b=1/28
3x/11=-3/22

1 Réponse

  • 3-(2a-3)=03 - 2a - 3 = 0
    - 2a = - 3 + 3
    a = 0

    2a-(1+5a)=4a
    2a - 1 - 5a = 4a
    2a - 5a - 4a = 1
    - 7a = 1
    a = - 1/7

    1/2y-(3-y)=5-2y
    1/2y - 3 + y = 5 - 2y
    1/2y + y + 2y = 3 + 5
    1/2y + 2/2y + 4/2y = 6/2 + 10/2
    y + 2y + 4y = 6 + 10
    7y = 16
    y = 16/7

    2t-(4-1/2t)=-1
    2t - 4 + 1/2t = - 1
    4/2t + 8/2 + 1/2t = - 2/2
    4t + 8 + t = - 2
    4t + t = - 2 - 8
    5t = - 10
    t = - 10/5
    t = - 2

    4x-1+2-x/5=x-3/10
    4x - 1 + 2 - x/5 = x - 3/10
    40/10x - 10/10 + 20/10 - 2/10x  = 10/10x - 3/10
    40x - 2x - 10x = 10 - 20 + 10 - 3
    28x = - 3
    x = - 3/28

    1-3x+4-2x/8=9-7x/4
    1 - 3x + 4 - 2/8x = 9 - 7/4x
    8/8 - 24/8x + 32/8 - 2/8x = 72/8 - 14/8x
    - 24x - 2x + 14x = - 8 - 35 + 72
    - 12x = 29
    x = - 29/12

    2/7-1/4b=1/28
    2/7 - 1/4b = 1/28
    8/28 - 7/28b = 1/28
    - 7/28b = - 8/28 + 1/28
    - 7b = - 7
    b = 7/1
    b = 1

    3x/11=-3/22

    6x/22 = 3/22
    6x = 3
    x = 3/6
    x = 1/3

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