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

Toán Lớp 8: Tìm x 5x^2 × (x+2) – x^2 – 2x = 0

Toán Lớp 8: Tìm x
5x^2 × (x+2) – x^2 – 2x = 0

Comments ( 2 )

  1. Giải đáp+Lời giải và giải thích chi tiết:
     5x²(x + 2) – x² – 2x = 0
    ⇔ 5x²(x + 2) – (x² + 2x) = 0
    ⇔ 5x²(x + 2) – x(x + 2) = 0
    ⇔ (x + 2)(5x² – x) = 0
    ⇔ x(x + 2)(5x – 1) = 0
    ⇒ x = 0
    hoặc x + 2 = 0  ⇒ x = -2
    hoặc 5x – 1 = 0  ⇒ x = \frac{1}{5}
    Vậy x = 0 ; x = – 2 ; x = \frac{1}{5}

  2. $5x^2 . (x+2) – x^2 – 2x = 0^{}$ 
    $⇔5x^2 . (x+2) – (x^2 + 2x) = 0^{}$ 
    $⇔5x^2 . (x+2) – x(x+2) = 0^{}$ 
    $⇔(x+2)(5x^2-x) = 0^{}$ 
    $⇔x(x+2)(5x-1) = 0^{}$ 
    $⇔\left[\begin{matrix} x=0\\ x+2=0\\5x-1=0\end{matrix}\right.$
    $⇔\left[\begin{matrix} x=0\\ x=-2\\5x=1\end{matrix}\right.$
    $⇔\left[\begin{matrix} x=0\\ x=-2\\x=\dfrac{1}{5}\end{matrix}\right.$

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