\(n+5⋮n-1\)
Mà \(n-1⋮n-1\)
\(\Leftrightarrow6⋮n-1\)
\(\Leftrightarrow n-1\inƯ\left(6\right)\)
\(\Leftrightarrow\left[{}\begin{matrix}n-1=1\-1=2\-1=3\-1=6\end{matrix}\right.\) \(\Leftrightarrow\left[{}\begin{matrix}n=2\=3\=4\=7\end{matrix}\right.\)
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