I x-2/3I+3/5=1 và 3/5 (2/3.x +1/3)^2 =4/9

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1. `|x – 2/3| + 3/5 = 1 3/5`

   `=> |x – 2/3| + 3/5 = 8/5`

   `=> |x – 2/3| = 8/5 – 3/5`

   `=> |x – 2/3| = 1`

   `=> x – 2/3 = 1`hoặc`-1`

   `TH1 : x – 2/3 = 1 => x = 1 + 2/3 = 1 2/3 = 5/3.`

   `TH2 : x – 2/3 = -1 => x = -1 + 2/3 = -3/3 + 2/3 = -1/3.`

   `(2/3 x + 1/3)^2 = 4/9`

   `=> (2/3 x + 1/3)^2 – (2/3)^2`

   `=> 2/3 x + 1/3 = 2/3`

   `=> 2/3 x = 2/3 – 1/3`

   `=> 2/3 x = 1/3`

   `=> x = 1/3 : 2/3`

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

   `=> x = 1/2.`

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2. @Bơ

   `| x-2/3|+3/5=1{ 3}/5`

   `| x-2/3|+3/5=8/5`

   `| x-2/3|=8/5 -3/5`

   `| x-2/3|=1`

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

   `x=1+2/3` hay `x=-1+2/3`

   `x=5/3` hay `x=-1/3`

   `(2/3.x +1/3)^2 =4/9`

   `(2/3.x +1/3)^2 = ( 2/3)^2`

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

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

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

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

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

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