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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 8: Tìm x sao cho 2x(x-2021)+2021-x=0

Tháng Tám 11, 2022 Toán học 2 Comments 0 views

Toán Lớp 8: Tìm x sao cho
2x(x-2021)+2021-x=0

Comments ( 2 )

  1. quynhmaithu
    quynhmaithu
    11 Tháng Tám, 2022 at 8:21 chiều
    Reply
    2x(x-2021)+2021-x=0
    <=>2x(x-2021)-(x-2021)=0
    <=>(2x-1)(x-2021)=0
    <=>\(\left[ \begin{array}{l}2x-1=0\\x-2021=0\end{array} \right.\) <=> \(\left[ \begin{array}{l}2x=1\\x=2021\end{array} \right.\) <=>\(\left[ \begin{array}{l}x=\dfrac{1}{2}\\x=2021\end{array} \right.\)
    vậy S={1/2;2021}

  2. ngocbichchau
    ngocbichchau
    11 Tháng Tám, 2022 at 8:20 chiều
    Reply
    2x(x-2021)+2021-x=0
    ⇔2x(x-2021)-(x-2021)=0
    ⇔(x-2021)(2x-1)=0
    ⇔x-2021=0⇒x=2021
         2x-1=0⇒2x=1⇒x=1/2
    Vậy S={2021,1/2}

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222-9+11+12:2*14+14 = ? ( )

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