Question

n+2 là ước của 7

Answer 1

\(n+2\inƯ\left(7\right)\)

\(\Leftrightarrow\left[{}\begin{matrix}n+2=1\\n+2=2\\n+2=-1\\n+2=-2\end{matrix}\right.\) \(\Leftrightarrow\left[{}\begin{matrix}n=-1\\n=0\\n=-3\\n=-4\end{matrix}\right.\)

Vậy ..

Answer 2

\(n+2\inƯ\left(7\right)\)

\(\Leftrightarrow\left[{}\begin{matrix}n+2=1\\n+2=7\\n+2=-1\\n+2=-7\end{matrix}\right.\) \(\Leftrightarrow\left[{}\begin{matrix}n=-1\\n=5\\n=-3\\n=-9\end{matrix}\right.\)

Vậy ..