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

Toán Lớp 8: Tìm x: e, $3x^{3}$ – $6x^{2}$ + 9x = 0

Toán Lớp 8: Tìm x:
e, $3x^{3}$ – $6x^{2}$ + 9x = 0

Comments ( 1 )

  1. Giải đáp+Lời giải và giải thích chi tiết:
    $3x^3-6x^2+9x=0\\3x(x^2-2x+3)=0\\3x[(x-1)^2+2]=0$<=>\(\left[ \begin{array}{l}3x=0\\(x-1)^2+2=0\end{array} \right.\) $\\$<=>\(\left[ \begin{array}{l}x=0\\(x-1)^2=-2(vô \ lí)\end{array} \right.\) $\\$Vậy\ x=0

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