$\frac{2}{5}$ . (1- $\frac{1}{2}$x) – 2x = 20%

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1. $\frac{2}{5}$ .(1-$\frac{1}{2}$.x)-2x=20%

   $\frac{2}{5}$-$\frac{1}{5}$.x-2x=$\frac{1}{5}$

   $\frac{2}{5}$-($\frac{1}{5}$.x+2x)=$\frac{1}{5}$

   $\frac{11}{5}$.x=$\frac{2}{5}$-$\frac{1}{5}$

   x=$\frac{1}{5}$:$\frac{11}{5}$

   x=$\frac{1}{5}$.$\frac{5}{11}$

   x=$\frac{1}{11}$ 

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2. Đáp án:  `x = 1/11`

    

   Giải thích các bước giải:

   `2/5 . ( 1 – 1/2 . x ) – 2x = 20%`

   `2/5 – 1/5 . x – 2x = 1/5`

   `2/5 – ( 1/5 . x + 2x ) = 1/5`

   `( 1/5 + 2 ) . x = 2/5 – 1/5`

   `( 1/5 + 10/5 ) . x = 1/5`

   `11/5 . x = 1/5`

   `x = 1/5 : 11/5`

   `x = 1/5 . 5/11`

   `x = 1/11`

   $\text { Vậy }$ `x = 1/11`

    

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