\(x\in Z\Rightarrow\dfrac{5}{x-1}\in Z\\\Rightarrow5⋮x-1\Rightarrow x-1\inƯ\left(5\right)=\left\{\pm1;\pm5\right\}\Rightarrow x=\left\{-4;0;2;6\right\}\)
Để biểu thức \(\dfrac{5}{x-1}\) là số nguyên thì \(x-1\in\left\{1;-1;5;-5\right\}\)
hay \(x\in\left\{2;0;6;-4\right\}\)