Respostas

2014-04-25T12:07:14-03:00
A={N=0,1,2,3,4,5,...}    naturais
B={Z=...,-3,-2,-1,0,1,2,3,4,...}    inteiros
C={Q= a/b , para todo a,b ∈ Z ; b≠0}    Racionais