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3
--- E Z
x-2

5
--- E Z
3-x

-1
--- E Z
2x+1​


Răspuns :

[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]