Răspuns:
X=[1, - 1,-2,2,3,-3,4,-4,5,-5,6,-6,7,-7,8,-8,9,-9,10,-10,11,-11,12,-12,13,-13,14,-14,-15,15,16,-16,17,-17,18,-18,19,-19,20,-20,21,-21,22,-22, 23,-23]
Def:
Cand un numar apartine multimi Z, multimea numerelor intregi, inseamna ca apartine multimilor Z+, N si Z-. Modulul numerelor-daca avem numar pozitiv, va fi egal cu numar pozitiv
Ex:
[4]=4.
DACA E NUMAR NEGATIV va fi egal exact la fel, daca ar fi numar pozitiv.
Ex:
[-4]=4
