Question

Afla x stiind ca:6 supra 2x+1=nr natural

Answer 1

nr nat => 6 divizibil cu 2x+1

dexi 2 x+1 poate fi 1,2,3 si 6

deci x va fi:

2x+1=1=>2x=0 => x=0

2x+1=2=> x=1/2

2x+1=3 => x=1

2x+1=6 => x=5/2

Answer 2

Răspuns:

Explicație pas cu pas:

2x + 1 ∈ D₆ = {1, 2, 3, 6}

2x + 1 = 1  ==> 2x = 1-1  ==> x = 0 ∈ N

2x + 1 = 2  ==> 2x = 2-1 ==> x = 1/2 ∉ N

2x + 1 = 3  ==> 2x = 3-1  ==> x = 2/2 = 1 ∈ N

2x + 1 = 6  ==> 2x = 6-1 ==> x = 5/2 ∉ N

x  ∈ {0, 1}