Đáp án:A
Giải thích các bước giải:
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\(\begin{array}{l}
- _x^2 + 2x \ne 0\\
\Rightarrow x\left( { - x + 2} \right) \ne 0\\
\Rightarrow \left\{ \begin{array}{l}
x \ne 0\\
x \ne 2
\end{array} \right.
\end{array}\)
