Lời giải:
$n-3\vdots n+8$
$n+8-11\vdots n+8$
$\Rightarrow 11\vdots n+8$
$\Rightarrow n+8\in\left\{1;-1; 11; -11\right\}$
$\Rightarrow n\in\left\{-7; -9; 3; -19\right\}$
\(n+8-11⋮n+8\Rightarrow n+8\inƯ\left(-11\right)=\left\{\pm1\right\}\)
n+8 | 1 | -1 |
n | -7 | -9 |