Question

determinati elementele multimilor A ={xEZ| 6/2x+1E Z}

Answer 1

2x+1 ∈ D₆
2x+1 = { 1 ; 2 ; 3 ; 6 }  | -1
2x = { 0 ; 1 ; 2 ; 5 }  | :2
x = { 0 ; 1/2 ; 1 ; 5/2 }
Dar x ∈ N => x= { 0 ; 1 }