Răspuns :
ZU=Z-U+3=3
Z=U
adica 11....1-1+3=3
22......2-2+3=3
33......3-3+3=3
..........................
99......9-9+3=3
NR SUNT 11,22,33,44,55,66,77,88,99.........
Z=U
adica 11....1-1+3=3
22......2-2+3=3
33......3-3+3=3
..........................
99......9-9+3=3
NR SUNT 11,22,33,44,55,66,77,88,99.........