Question

rezolvati multimea A = (x e Z | 5 pe 2x -1 e Z) brainly

Answer 1

5/(2x-1)=>
2x-1=1=> x=1
2x-1=-1=> x=0
2x-1=5=> x=3
2x-1=-5=> x=-2
=> A={-2,0,1,3}

Answer 2

A = (x e Z | 5 /(2x -1) ∈ Z)

inseamna ca 2x-1 = D₅ = {-5; -1; 1; 5}

=> 2x-1 =-5   x = -2

    2x-1 = -1    x = 0

    2x-1 =  1     x = 1

    2x-1 = 5      x = 3

=> 5 / (2x-1) ∈ Z pentru x = {-2; 0; 1; 3} ∈ Z  !