Question

va rog <3 multumesc anticipat

Answer 1

7/2x+1 apartine Z

Altfel zis 2x+1 apartine D7 iar D7= {-1, -7, 1,7}

2x+1 = -7=> 2x = -8=> x = -4

2x+1 = -1=> 2x = -2 => x = -1

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

2x+1 = 7=> 2x = 6 => x = 3

Deci A ={-1, 0, 3, 4}