9.
\(\left\{{}\begin{matrix}2023-x\ne0\\\dfrac{-2022}{2023-x}\ge0\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}x\ne2023\\2023-x< 0\end{matrix}\right.\)
\(\Rightarrow x>2023\)
10.
\(\left\{{}\begin{matrix}x-3\ne0\\x-3\ge0\end{matrix}\right.\) \(\Rightarrow x>3\)
11.
\(\left\{{}\begin{matrix}x-1\ne0\\x-1\ge0\end{matrix}\right.\) \(\Rightarrow x>1\)
12.
\(\left\{{}\begin{matrix}\sqrt{x}-5\ne0\\x\ge0\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}\sqrt{x}\ne5\\x\ge0\end{matrix}\right.\)
\(\Leftrightarrow x\ge0;x\ne25\) (tất cả các đáp án sai, người ra đề quên bình phương khi giải)
13.
\(\left\{{}\begin{matrix}1-\sqrt{x}\ne0\\x\ge0\end{matrix}\right.\) \(\Rightarrow x\ge0;x\ne1\)
14.
\(\dfrac{x-2022}{2023}\ge0\Rightarrow x\ge2022\)
