[tex] \frac{3}{x - 2} [/tex]
€Z
[tex] = > (x - 2) |3 = > x - 2[/tex]
€{1,3,0,-1,-3}
[tex] \frac{5}{3 - x} [/tex]
€Z
[tex] = > (3 - x) |5 = > 3 - x[/tex]
€{1,0,5,-1,-5}
[tex] \frac{ - 1}{2x + 1} [/tex]
€Z
[tex] = > 2x + 1 | - 1 = > 2x + 1[/tex]
€{1,0,-1}
Explicație :Dacă a€Z, b€Z*, atunci
[tex] \frac{a}{b} [/tex]
€Z
[tex] = > b |a.[/tex]