Question

determinați x€N astfel încât: x-1 € D 15

Answer 1

x-1 € D15={-15;-5;-3;-1;1;3;5;15}
Cazul 1. X-1=-1 -> x=0
Cazul 2. X-1=1 -> x=2
Cazul 3. X-1=3 -> x=4
Cazul 4. X-1=5 -> x=6
Cazul 5. X-1=15 -> x=16