Tìm x a) 3/8-1/6.x=1/4 b)75%.x+1,25.x=-1 1/2 c)|x-2|+1/3=2/3

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1. `a) 3/8 – 1/6x = 1/4`

   `1/6x = 3/8 – 1/4`

   `1/6x = 3/8 – 2/8`

   `1/6x = 1/8`

   `x = 1/8 : 1/6`

   `x = 1/8 . 6/1`

   `x = 6/8  = 3/4.`

   `b) 75%x + 1,25x = -1 1/2`

   `3/4x + 5/4x = -3/2`

   `(3/4 + 5/4)x = -3/2`

   `2x = -3/2`

   `x = -3/2 : 2`

   `x = -3/2 . 1/2`

   `x = -3/4.`

   `c) |x – 2| `+ `1/3` = `2/3`

   `|x – 2| = 2/3 – 1/3`

   `|x – 2| = 1/3`

   `x – 2 = 1/3` hoặc `-1/3`

   `TH1 : x – 2 = 1/3`

   `x = 1/3 + 2`

   `x = 1/3 + 6/3`

   `x = 7/3.`

   `TH2 : x – 2 = -1/3`

   `x = -1/3 + 2`

   `x = -1/3 + 6/3`

   `x = 5/3.`

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2. Đáp án:

    

   Giải thích các bước giải:

   a) -1/6x=1/4-3/8

   -1/6x=-1/8

   x=6/8=3/4

   b)2x=-1 1/2

   x=-3/4

   c)|x-2|=1/3

   +)x-2=1/3

   x=7/3
   +)-x+2=1/3

   x=5/3

    

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