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

Toán Lớp 8: tìm x x^3-6x^2+9x=0 làm nhanh giúp mình mình cảm ơn

Toán Lớp 8: tìm x
x^3-6x^2+9x=0 làm nhanh giúp mình mình cảm ơn

Comments ( 2 )

  1. x^3-6x^2+9x=0
    => x(x^2 -6x+9)=0
    => x(x-3)^2 =0
    => x=0 hoặc (x-3)^2 =0
    => x=0 hoặc x-3=0
    => x=0 hoặc x=3

  2. x^3 – 6x^2 + 9x = 0
    => x ( x^2 – 6x + 9 ) = 0
    => x ( x – 3 )^2 = 0
    => \(\left[ \begin{array}{l}x=0\\(x-3)^2 = 0\end{array} \right.\) 
    => \(\left[ \begin{array}{l}x=0\\x-3=0\end{array} \right.\) 
    => \(\left[ \begin{array}{l}x=0\\x=3\end{array} \right.\) 
    Vậy x $\in$ { 0 ; 3 }  

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