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

Toán Lớp 8: (2x-3)^2=(3x+2)^2 tim x!! EZ PHAI HEM??

Toán Lớp 8: (2x-3)^2=(3x+2)^2 tim x!!
EZ PHAI HEM??

Comments ( 2 )

  1. Giải đáp+Lời giải và giải thích chi tiết:
    (2x-3)^2=(3x+2)^2
    $⇔\left[\begin{matrix}2x-3=3x+2\\3-2x=3x+2\end{matrix}\right.$
    $⇔\left[\begin{matrix}3x-2x=-3-2\\3x+2x=3-2\end{matrix}\right.$
    $⇔\left[\begin{matrix}x=-5\\5x=1\end{matrix}\right.$
    $⇔\left[\begin{matrix}x=-5\\x=\dfrac{1}{5}\end{matrix}\right.$
    Vậy S={-5;\frac{1}{5}}

  2. $\\$
    Giải đáp + giải thích các bước giải :
    $(2x-3)^2=(3x+2)^2\\⇔(2x-3)^2-(3x+2)^2=0\\⇔(2x-3-3x-2)(2x-3+3x+2)=0\\⇔(-x-5)(5x-1)=0\\⇔\left[ \begin{array}{l}-x-5=0\\5x-1=0\end{array} \right.\\⇔\left[ \begin{array}{l}-x=5\\5x=1\end{array} \right.\\⇔\left[ \begin{array}{l}x=-5\\x=\dfrac{1}{5}\end{array} \right.$
    Vậy $x=-5,x=\dfrac{1}{5}$
     

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