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

Toán Lớp 8: 3x (2x – 10) – 5 + 10x = 0 Giúp với ạ!

Toán Lớp 8: 3x (2x – 10) – 5 + 10x = 0
Giúp với ạ!

Comments ( 2 )

  1. $\\3x(2x-1)-5+10x=0\\⇔ 3x(2x-1)+(10x-5)=0\\⇔3x(2x-1)+5(2x-1)=0\\⇔ (2x-1)(3x+5)=0\\⇔\left[ \begin{array}{l}2x-1=0\\3x+5=0\end{array} \right.\\⇔\left[ \begin{array}{l}x=\dfrac{1}{2}\\x=\dfrac{-5}{3}\end{array} \right.\\\text{Vậy}x=\dfrac{1}{2},x=\dfrac{-5}{3}$
     

  2. Giải đáp+Lời giải và giải thích chi tiết:
    3x(2x-1)-5+10x=0
    ⇔3x(2x-1)-(5-10x)=0
    ⇔3x(2x-1)-5(1-2x)=0
    ⇔3x(2x-1)+5(2x-1)=0
    ⇔(2x-1)(3x+5)=0
    $⇔\left[\begin{matrix} 2x-1=0\\ 3x+5=0\end{matrix}\right.$
    $⇔\left[\begin{matrix} 2x=1\\ 3x=-5\end{matrix}\right.$
    $⇔\left[\begin{matrix} x=\dfrac{1}{2}\\ x=-\dfrac{5}{3}\end{matrix}\right.$
         Vậy x=1/2 hoặc x=-5/3
    $\text{#LinhSad}$

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