Question

va rog revolvati 1,2,3,4(a,b,c,d)

Answer 1

1. {2,3};  {4,5};  {1,2,3,4};  {2,3,0};  {0,1 3 5}

2. multime, carte, matematica, calculator
    {m,u,l,t,i,e};  {c,a,r,t,e};  {m,a,t,e,i,c};  {c,a,l,u,t,o,r}

3. Multimea cifrelor pare:  {0,2,4,6,8}
    Multimea cifrelor impare: {1,3,5,7,9}

4.a)  x∈A
   b)  y∉B
   c)  C⊃1
   d)  card.D=5