Câu hỏi:
- A \(\begin{array}{l}
a)\,\,m > 3\\
b)\,\,m \ne 4
\end{array}\) - B \(\begin{array}{l}
a)\,\,m > 3\\
b)\,\,m \ne 1
\end{array}\) - C \(\begin{array}{l}
a)\,\,m \ge 3\\
b)\,\,\left\{ \begin{array}{l}
m \ne 1\\
m \ne 4
\end{array} \right.
\end{array}\) - D \(\begin{array}{l}
a)\,\,m > 3\\
b)\,\,\left\{ \begin{array}{l}
m \ne 1\\
m \ne 4
\end{array} \right.
\end{array}\)
Phương pháp giải:
Lời giải chi tiết:
\(\eqalign{& a)\,\,DK:\left\{ \matrix{m - 3 \ge 0 \hfill \cr m - 3 \ne 0 \hfill \cr} \right. \Leftrightarrow m > 3 \cr & b)\,\,DK:\left\{ \matrix{{{1 - m} \over {4 - m}} \ne 0 \hfill \cr 4 - m \ne 0 \hfill \cr} \right. \Leftrightarrow \left\{ \matrix{1 - m \ne 0 \hfill \cr 4 - m \ne 0 \hfill \cr} \right. \Leftrightarrow \left\{ \matrix{m \ne 1 \hfill \cr m \ne 4 \hfill \cr} \right. \cr} \)
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