-2/3.x+1/5=3/10 |x|-3/4=5/3 2/5+3/5.(x-1)=1/10

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1. Đáp án+Giải thích các bước giải:

   `a)`

   `-2/3.x+1/5=3/10`

   `\to-2/3x=3/10-1/5`

   `\to-2/3x=1/10`

   `\tox=1/10:-2/3`

   `\tox=-3/20`

   Vậy `x=-3/20`

   `b)`

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

   `\to|x|=5/3+3/4`

   `\to|x|=29/12`

   `\to` \(\left[ \begin{array}{l}x=\dfrac{29}{12}\\x=-\dfrac{29}{12}\end{array} \right.\) 

   Vậy `x\in{29/12;-29/12}`

   `c)`

   `2/5+3/5.(x-1)=1/10`

   `\to3/5(x-1)=1/10-2/5`

   `\to3/5(x-1)=-3/10`

   `\tox-1=-3/10:3/5`

   `\tox-1=-1/2`

   `\tox=1/2`

   Vậy `x=1/2`

    

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2. `-2/3.x+1/5=3/10`

   `-2/3.x=3/10-1/5`

   `-2/3.x=1/10`

   `x=1/10: -2/3`

   `x=-3/20`

   Vậy `x=3/(-20)`

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

   `|x|=5/3+3/4`

   `|x|=29/12`

   Vậy `x=(-29/12;29/12)`

   `2/5+3/5.(x-1)=1/10`

   `2/5+(3(x-1))/5=1/10`

   `2/5+(3x-3)/5=1/10`

   `2/5+(3x-3)/5-2/5=1/10-2/5`

   `(3x-3)/5=-3/10`

   `3x-3=-3/2`

   `3x=3/2`

   `x=1/2`

   Vậy `x=1/2`

    

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