Question

Fie multimea. A={x€z|-12supra 2x+1€N}si B={x€Z|-18supra2x-1€N}

Answer 1

-12 supra 2x+1 € N, x€N 
-12<2x+1>0 | -1
-13<2x>-1 | :2
-6,5<x>-0,5
x={-6,5;-0,5} nu apartine N
A={}

-18 supra 2x-1€ N, x€ N
-18<2x-1>0 | +1
-17<2x>1 | :2
-8,5<x>0,5
x={-8,5;0,5}
B={0}

( nu sunt sigura de raspuns)