Tìm x: a) 1/4x-|-7/5|=-5/3 b) 3x -1/7 = 1/14 – 1/21 Giải giúp mình nha.????

Question

Tìm x:
a) 1/4x-|-7/5|=-5/3
b) 3x -1/7 = 1/14 – 1/21
Giải giúp mình nha.????

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Doris 5 years 2021-05-19T19:07:38+00:00 2 Answers 136 views 0

Answers ( )

  1. nguyetanh
    -1
    2021-05-19T19:08:50+00:00
    Reply

    Đáp án:

    a) `x=-16/15` 

    b) `x=1/18`

    Giải thích các bước giải:

    a)

    `1/4x-|-7/5|=-5/3`

    `to 1/4x-7/5=-5/3`

    `to 1/4x=-5/3+7/5`

    `to 1/4x=-4/15`

    `to x=(-4/15) : 1/4`

    `to x=-16/15`

    Vậy `x=-16/15` 

    b)

    `3x-1/7=1/14-1/21`

    `to 3x=1/14-1/21+1/7`

    `to 3x=1/6`

    `to x=1/6 : 3`

    `to x=1/18`

    Vậy `x=1/18`

  2. Farah
    0
    2021-05-19T19:09:35+00:00
    Reply

    Giải thích các bước giải:

    `a) 1/4x-|-7/5|=-5/3`
    `=>1/4x-7/5=-5/3`
    `=>1/4x=-5/3+7/5`
    `=>1/4x=-25/15+21/15`
    `=>1/4x=-4/15`
    `=>x=-4/15:1/4`
    `=>x=-4/15 . 4/1`
    `=>x=-16/15`
    Vậy `x=-16/15`
    `b) 3x -1/7 = 1/14 – 1/21`
    `=>3x=1/14-1/21+1/7`
    `=>3x=(1/14+1/7)-1/21`
    `=>3x=(1/14+2/14)-1/21`
    `=>3x=3/14-1/21`
    `=>3x=9/42-2/42`
    `=>3x=1/6`
    `=>x=1/6:3`
    `=>x=1/6 . 1/3`
    `=>x=1/18`
    Vậy `x=1/18`

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