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

Toán Lớp 6: (3x+2)^4=(3x+2)^6 Mn giúp tui đc ko , tui bị quên cách làm rồi ;-;

Toán Lớp 6: (3x+2)^4=(3x+2)^6
Mn giúp tui đc ko , tui bị quên cách làm rồi ;-;

Comments ( 2 )

  1. $\\$
    (3x+2)^4=(3x+2)^6
    =>(3x+2)^4-(3x+2)^6=0
    => (3x+2)^4[1 – (3x+2)^2]=0
    => \(\left[ \begin{array}{l}(3x+2)^4=0\\1-(3x+2)^2=0\end{array} \right.\) $\\$ => \(\left[ \begin{array}{l}3x+2=0\\(3x+2)^2=1\end{array} \right.\) $\\$ => \(\left[ \begin{array}{l}x=\dfrac{-2}{3}\\3x+2=1\\3x+2=-1\end{array} \right.\) $\\$ => \(\left[ \begin{array}{l}x=\dfrac{-2}{3}\\x=\dfrac{-1}{3}\\x=-1\end{array} \right.\) 
    Vậy x=(-2)/3, x=(-1)/3 ,x=-1
     

  2. Giải đáp+Lời giải và giải thích chi tiết:
    $(3x+2)^4=(3x+2)^6\\(3x+2)^6-(3x+2)^4=0\\(3x+2)^4[(3x+2)^2-1]=0\\TH1:(3x+2)^4=0\\3x+2=0\\3x=-2\\x=-\dfrac 23$
    TH2:
    3x+2=\sqrt{1}
    3x=-1
    x=-1/3
    TH3:
    3x+2=-\sqrt{1}
    3x=-3
    x=-1

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