║x-4/5 ║=3/4 hellllllllllllllllllllllllllllllllllllll

0 bình luận về “║x-4/5 ║=3/4 hellllllllllllllllllllllllllllllllllllll”

1. | x – 4/5 | = 3/4

   TH1: x – 4/5 = 3/4

    => x = 3/4 + 4/5

    => x = 31/20

   TH2: x – 4/5 = -3/4

    => x = (-3/4) + 4/5

    => x = 1/20

   Vậy x = 31/20 hoặc x = 1/20.

    

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2. Đáp án:

   `x ∈ {31/20; 1/20}`

   Giải thích các bước giải:

    `|x – 4/5| = 3/4`

   $⇒ \left[ \begin{array}{l}x – \dfrac{4}{5}=\dfrac{3}{4}\\x – \dfrac{4}{5}=\dfrac{-3}{4}\end{array} \right. ⇒ \left[ \begin{array}{l}x=\dfrac{31}{20}\\x=\dfrac{1}{20}\end{array} \right.$

   `Vậy` `x ∈ {31/20; 1/20}`

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