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

Toán Lớp 8: (x + 8)(x – 8) = (x – 4)(x² + 4x + 16)

Toán Lớp 8: (x + 8)(x – 8) = (x – 4)(x² + 4x + 16)

Comments ( 2 )

  1. Giải đáp+Lời giải và giải thích chi tiết:
    (x+8)(x-8)=(x-4)(x^2+4x+16)
    <=>x^2-8^2=x^3-4^3
    <=>x^2-64=x^3-64
    <=>x^3-x^2-64+64=0
    <=>x^2(x-1)=0
    <=>[(x^2=0),(x-1=0):}
    <=>[(x=0),(x=1):}
    Vậy S={0;1}

  2. (x+8)(x-8) = (x-4)(x^2+4x+16)
     => x^2 – 64 = x^3 – 64
    => x^2  -x^3 =0
    => x^2(x -1) =0
    => \(\left[ \begin{array}{l}x^2=0\\x-1=0\end{array} \right.\) 
    => \(\left[ \begin{array}{l}x=0\\x=1\end{array} \right.\) 
    Vậy x \in {0 ; 1}    

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