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

Toán Lớp 6: tìm x $x^{2020}$ = $x^{2022}$

Toán Lớp 6: tìm x
$x^{2020}$ = $x^{2022}$

Comments ( 2 )

  1. Giải đáp + Lời giải và giải thích chi tiết:

    x^(2020) = x^(2022)

    ⇔ x^(2020) – x^(2022) = 0

    ⇔ x^(2020) * 1 – x^(2020) * x^2 = 0

    ⇔ x^(2020) * ( 1 – x^2 ) = 0

    ⇔ $\left[\begin{matrix} x = 0\\ 1 – x^2 = 0\end{matrix}\right.$

    ⇔ $\left[\begin{matrix} x = 0\\ x^2 = 1\end{matrix}\right.$ 

    ⇔ $\left[\begin{matrix} x = 0 \\x = +-1 \end{matrix}\right.$

    Vậy x ∈ { 0 ; +-1 }

  2. x^2020 =x^2022

    =>x^2020 – x^2022 =0

    =>x^2020 (1-x^2 )=0

    => \(\left[ \begin{array}{l}x^{2020} =0\\1-x^2 =0\end{array} \right.\) 

    => \(\left[ \begin{array}{l}x=0\\x^2 =1\end{array} \right.\) 

    => \(\left[ \begin{array}{l}x=0\\x=+-1\end{array} \right.\) 

    Vậy x∈{0;+-1}

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