Question

[Nguyễn Ngọc Anh]

  

Answer 1

[Nguyễn Việt Lâm]

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

\(\Rightarrow A=\left\{\dfrac{1}{2};2\right\}\)

Answer 2

[Vũ Nguyễn Nam Khánh]

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