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

Toán Lớp 8: 4X x (X – 3 ) – 4X^2 = 24 tìm X

Toán Lớp 8: 4X x (X – 3 ) – 4X^2 = 24 tìm X

Comments ( 2 )

  1. $\text{4x(x-3)-4x²=24}$
    $\text{⇔4x²-12x-4x²=24}$
    $\text{⇔-12x=24}$
    $\text{⇔x=-2}$
    $\text{Vậy x=-2}$

  2. 4x(x-3)-4x^2=24
    ⇔4x.x-4x.3-4x^2=24
    ⇔(4x^2-4x^2)-12x=24
    ⇔-12x=24
    ⇔x=-2
     Vậy x=-2

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