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

Toán Lớp 6: Tìm ????: ????^8 = ????

Toán Lớp 6: Tìm ????:
????^8 = ????

Comments ( 2 )

  1. x^8 = x
    => x^8 – x = 0
    => x . x^7 – x = 0
    => x . (x^7 – 1) = 0
    => \(\left[ \begin{array}{l}x=0\\x^7 – 1 = 0\end{array} \right.\) 
    => \(\left[ \begin{array}{l}x = 0\\x^7 = 1\end{array} \right.\) 
    => \(\left[ \begin{array}{l}x=0\\x=1\end{array} \right.\) 
    Vậy x ∈ {0 ; 1}

  2. Giải đáp:
     x^8 = x
    x^8 – x = 0
    x(x^7 – 1) = 0
    ⇒\(\left[ \begin{array}{l}x=0\\x^7 – 1 = 0\end{array} \right.\) 
    ⇒\(\left[ \begin{array}{l}x=0\\x = 1\end{array} \right.\) 
    Vậy x \in {0 ; 1}
     

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