Question

cum fac exercitiul 5

Answer 1

Pt multimea A , n≠0⇒n∈{1,2,3,4,....}
iei pe rand valori pt n si calculezi 2n
pt n=1⇒ x=2×1=2
pt n=2⇒ x=2×2=4
pt n=3⇒ x=2×3=6 
A={2,4,6,8,...}

Pt B ,n∈{0,1,2,3,...}
pt n=0 ⇒x=2×0+1=1
pt n=1⇒ x=2x1+1=2+1=3
pt n=2 ⇒x=2×2+1=4+1=5
pt n=3⇒ x=2×3+1=6+1=7
B={1,3,5,7,9,,...}

A∪B={1,2,3,4,5,6,7,...}⇒A∪B= multimea numerelor naturale nenule (N *)