Răspuns:
1.A={1 5 15}
2.a){2,8} b){2, 4, 6} c){2, 4, 6, 8 ,10} d){1, 2, 3, ... ,7, 9}
3. a)F b)F c)A d)A e)F f)A
4. a){D1, D2, D3, ..., D10} b){1, 2, 3, Infinit(scrii un 8 culcat)}
c)A={1,2,3,4,5,6,...17{
5.A={a,b,x,n,a}
B=}a,b,x,m,d}
6 2x+2=6 2x=4 x=2
