Question

x.(2x-1).(x+3)=0

Answer 1

\(x\left(2x-1\right)\left(x+3\right)=0\)

\(\Leftrightarrow x=0;2x-1=0;x+3=0\)

*) \(2x-1=0\)

\(\Leftrightarrow x=\dfrac{1}{2}\)

*) \(x+3=0\)

\(\Leftrightarrow x=-3\)

Vậy \(x=0;x=\dfrac{1}{2};x=-3\)

Answer 2

Ta có: \(x\left(2x-1\right)\left(x+3\right)=0\)

\(\Leftrightarrow\left[{}\begin{matrix}x=0\\2x-1=0\\x+3=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=0\\x=\dfrac{1}{2}\\x=-3\end{matrix}\right.\)

Vậy: \(S=\left\{0;\dfrac{1}{2};-3\right\}\)