Question

enumerati elementele multimilor
A={x | x =k(la puterea a doua),k∈N} B={y | y ∈ N,y=k:5,k∈N*}
C={z |z =3k,k∈N*}, D={t | t∈ N,t-5>1}    Cine ma ajuta si pe mine?

Answer 1

A - reprezinta patratele perfecte
A={1,4,9,16,25,36,49,64,81,100,121,...,infinit}

B - reprezinta multimea nr. naturale nenule, k - multiplu de 5, k impartit la 5 (avem 5:5=1, 10:5=2, 15:5=3 etc)
B={1,2,3,4,5,6,7,8,...,infinit}

C - reprezinta multimea multiplilor lui 3
C={3,6,9,12,15,18,21,24,27,30,33,36,...,infinit}

D - avem inecuatia t-5>1, t>1+5, t>6
D={7,8,9,10,11,12,13,14,15,...,infinit}