Question

3
--- E Z
x-2

5
--- E Z
3-x

-1
--- E Z
2x+1​

Answer 1

$\frac{3}{x - 2}$

€Z

$= > (x - 2) |3 = > x - 2$

€{1,3,0,-1,-3}

$\frac{5}{3 - x}$

€Z

$= > (3 - x) |5 = > 3 - x$

€{1,0,5,-1,-5}

$\frac{ - 1}{2x + 1}$

€Z

$= > 2x + 1 | - 1 = > 2x + 1$

€{1,0,-1}

Explicație :Dacă a€Z, b€Z*, atunci

$\frac{a}{b}$

€Z

$= > b |a.$