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

Toán Lớp 8: Tìm x : ( 2x+3 )( 2x – 3 ) – x( x – 2 ) =2x

Toán Lớp 8: Tìm x : ( 2x+3 )( 2x – 3 ) – x( x – 2 ) =2x

Comments ( 2 )

  1. Giải đáp + giải thích các bước giải :  
    ( 2x+3 )( 2x – 3 ) – x( x – 2 ) =2x $\\$ \Leftrightarrow 4x^2 – 9 – x^2 + 2x = 2x $\\$ \Leftrightarrow 3x^2 – 9 = 0 $\\$ \Leftrightarrow 3x^2 = 9 $\\$ \Leftrightarrow x^2 = 3 $\\$ \Leftrightarrow x = +- sqrt3 $\\$ Vậy : x = +-sqrt3

  2. $⇔ 4x^2 – 9 – x^2 + 2x = 2x$
    $⇔4x^2 – 9 – x^2 = 0$
    $⇔3x^2 – 9=0$
    $⇔x^2-3=0$
    $⇔x^2 = 3$
    $⇔x=\sqrt3$ hoặc $x= \sqrt-3$

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

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