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

Toán Lớp 8: Tìm số hữu tỉ x biết:x(x-3)-(x^2-5x)=0

Toán Lớp 8: Tìm số hữu tỉ x biết:x(x-3)-(x^2-5x)=0

Comments ( 2 )

  1.      $x(x-3)-(x^2-5x)=0$
    $⇔x(x-3)-x(x-5)=0$
    $⇔x[(x-3)-(x-5)]=0$
    $⇔x(x-3-x+5)=0$
    $⇔2x=0$
    $⇔x=0:2$
    $⇔x=0$

  2. x(x-3)-(x^2-5x)=0
    ⇔x^2-3x-x^2+5x=0
    ⇔2x=0
    ⇔x=0
    Vậy x=0
     

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

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