Question

Tìm số tự nhiên, n biết 3⋮(n +1)

Answer 1

\(3⋮n+1\)

\(\Leftrightarrow n+1\inƯ\left(3\right)\)

\(\Leftrightarrow\left[{}\begin{matrix}n+1=1\\n+1=3\end{matrix}\right.\) \(\Leftrightarrow\left[{}\begin{matrix}n=0\\n=2\end{matrix}\right.\)

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