Question

Tìm x : 

\(2x^2-6x=0\)

Answer 1

\(\Rightarrow2x\left(x-3\right)=0\)

\(\Rightarrow\left[\begin{array}{nghiempt}2x=0\\x-3=0\end{array}\right.\)

\(\Rightarrow\left[\begin{array}{nghiempt}x=0\\x=3\end{array}\right.\)

Vậy x=0;x=3

Answer 2

\(2x^2-6x=0\)

\(\Leftrightarrow2x.x-2x.3=0\)

\(\Leftrightarrow2x.\left(x-3\right)=0\)

\(\Leftrightarrow\left[\begin{array}{nghiempt}2x=0\\x-3=0\end{array}\right.\)

\(\Leftrightarrow\left[\begin{array}{nghiempt}0\\3\end{array}\right.\)

Vậy \(x\in\left\{0;3\right\}\)

 

 

Answer 3

\(2x^2-6x=0\)

\(\Leftrightarrow2x\left(x-3\right)=0\)

\(\Leftrightarrow\left[\begin{array}{nghiempt}2x=0\\x-3=0\end{array}\right.\)

\(\Leftrightarrow\left[\begin{array}{nghiempt}x=0\\x=3\end{array}\right.\)

Answer 4

\(2x^2-6x=0\)
\(\Leftrightarrow2x\left(x-3\right)=0\)

\(\Leftrightarrow\left[\begin{array}{nghiempt}2x=0\\x-3=0\end{array}\right.\)

\(\Leftrightarrow\left[\begin{array}{nghiempt}x=0\\x=3\end{array}\right.\)
\(\text{Vậy x=0 hoặc x=3}\)

Answer 5

\(2x^2-6x=0\)

\(\Leftrightarrow2x\left(x-3\right)=0\)

\(\Leftrightarrow\begin{cases}2x=0\\x-3=0\end{cases}\)\(\Leftrightarrow\begin{cases}x=0\\x=3\end{cases}\)

Vậy tập nghiệm của phương trình trên là \(S=\left\{0;3\right\}\)