|4x – 2/3 | = 1/5 -6x +1/2=-10x – 3/5 +1/4

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1. Đáp án:trongl4x-2/3l=1/5

   x=13/60 và x=7/60

   trong -6x+1/2=-10x-3/5+1/4

   x=-17/80

    

   Giải thích các bước giải:l4x-2/3l=1/5

   có hai trường hợp:

   *4x-2/3=1/5

   4x=1/5+2/3

   4x=13/15

   x=13/15:4

   x=13/15.1/4

   x=13/60

   *4x-2/3=-1/5

   4x=-1/5+2/3

   4x=7/15

   x=7/15:4

   x=7/15.1/4

   x=7/60

    -6x+1/2=-10x-3/5+1/4

   -6x+10x=-3/5+1/4-1/2

   -6x+10x=-17/20

   (-6+10)x=-17/20

   4x=-17/20

   x=-17/20:4

   x=-17/20.1/4

   x=-17/80

    

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2. $|4x-\dfrac{2}{3}|=\dfrac{1}{5}$

   TH1: $4x-\dfrac{2}{3}=\dfrac{1}{5}$

            $4x=\dfrac{13}{15}$

            $x=\dfrac{13}{60}$

   TH2: $4x-\dfrac{2}{3}=-\dfrac{1}{5}$

            $4x=\dfrac{7}{15}$

            $x=\dfrac{7}{60}$

   Vậy $x\in\bigg\{\dfrac{13}{60};\dfrac{7}{60}\bigg\}$

   $-6x+\dfrac{1}{2}=-10x-\dfrac{3}{5}+\dfrac{1}{4}$

   $-6x+10x=\dfrac{-3}{5}+\dfrac{1}{4}-\dfrac{1}{2}$

   $4x=\dfrac{-17}{20}$

   $x=\dfrac{-17}{20}:4$

   $x=\dfrac{-17}{20}\cdot\dfrac{1}{4}$

   $x=\dfrac{-17}{80}$

   Vậy $x=\dfrac{-17}{80}$

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