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

Toán Lớp 9: Giải PT : – 3x^2 + 2x = 1 = 0

Toán Lớp 9: Giải PT :
– 3x^2 + 2x = 1 = 0

Comments ( 2 )

  1. $\#Lynn2007$

    -3x^2+2x+1=0
    <=>-3x^2+3x-x+1=0
    <=>-3x(x-1)-(x-1)=0
    <=>(-3x-1)(x-1)=0
    <=>-(3x+1)(x-1)=0
    <=>(3x+1)(x-1)=0
    <=> \(\left[ \begin{array}{l}3x+1=0\\x-1=0\end{array} \right.\) 
    <=> \(\left[ \begin{array}{l}x=\dfrac{-1}{3}\\x=1\end{array} \right.\) 

  2. Giải đáp:
     
    Lời giải và giải thích chi tiết:
    – 3x^2 + 2x = 1 = 0
    -3x^2 – x  +3x  +1 = 0
    ( -3x^2 -x) +(3x+1)= 0
    -x (3x+1) +(3x+1).1 = 0
    (3x+1)(-x+1)= 0
    (3x+1)(1-x) = 0
    =>\(\left[ \begin{array}{l}3x+1=0\\1-x= 0\end{array} \right.\) 
    =>\(\left[ \begin{array}{l}3x= -1\\x=1\end{array} \right.\) 
    =>\(\left[ \begin{array}{l}x=-\dfrac{1}{3}\\x=1\end{array} \right.\) 
    vậy x= -1/3; x=1

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

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