Đáp án:
Giải thích các bước giải:
\(\begin{array}{l}
DK:x \ne 0\\
\frac{5}{x} < 1 \to \frac{{5 - x}}{x} < 0\\
\to \left[ \begin{array}{l}
\left\{ \begin{array}{l}
5 - x < 0\\
x > 0
\end{array} \right.\\
\left\{ \begin{array}{l}
5 - x > 0\\
x < 0
\end{array} \right.
\end{array} \right. \to \left[ \begin{array}{l}
\left\{ \begin{array}{l}
x > 5\\
x < 0
\end{array} \right.\left( l \right)\\
\left\{ \begin{array}{l}
x < 5\\
x < 0
\end{array} \right.
\end{array} \right.\\
\to x < 0
\end{array}\)
