Ai giúp em với!!!!!! Tìm x ạ

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Ai giúp em với!!!!!! Tìm x ạ
ai-giup-em-voi-tim-a

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Ladonna 4 years 2020-11-27T01:08:59+00:00 2 Answers 50 views 0

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  1. Sigrid
    0
    2020-11-27T01:10:35+00:00
    Reply

    Đáp án:

     

    Giải thích các bước giải:

     $b) (2x-3)^{2}=9$

    $⇔$\(\left[ \begin{array}{l}(2x-3)^{2}=3^{2}\\(2x-3)^{2}=(-3)^{2}\end{array} \right.\) 

    $ $

    $⇔$\(\left[ \begin{array}{l}2x-3=3\\2x-3=-3\end{array} \right.\) 

    $ $

    $⇔$\(\left[ \begin{array}{l}2x=6\\2x=0\end{array} \right.\) 

    $ $

    $⇔$\(\left[ \begin{array}{l}x=3\\x=0\end{array} \right.\) 

    $ $

    $ $

    $c) (x-\dfrac{1}{3})^{2}=\dfrac{1}{25}$

    $ $

    $⇔$\(\left[ \begin{array}{l}x-\frac{1}{3}=\frac{1}{5}\\x-\frac{1}{3}=\frac{-1}{5}\end{array} \right.\) 

    $ $

    $⇔$\(\left[ \begin{array}{l}x=\frac{8}{15}\\x=\frac{2}{15}\end{array} \right.\) 

  2. Philomena
    0
    2020-11-27T01:10:41+00:00
    Reply

    `b)(2x-3)^2=9`

    `(2x-3)^2=3^2`

    `2x-3=3`

    `2x=6`

    `x=3`

    `c)(x-1/3)^2=1/25`

    `(x-1/3)^2=(1/5)^2`

    `x-1/3=1/5`

    `x=8/15`

     

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )