Question

Determinati elementele multimii C = { x e N | x \leq 27 ; 8/ x+5}.

Answer 1

daca x≤ 27⇒ x+5≤ 32
8 divide x+5 ⇒ x+5 este multiplu de 8
X+5 ∈ {8,16,24,32}⇒ rezolvi x+5=8 ⇒ x=3
x+5=16 ⇒ x=11
x+5=24 ⇒ x=19
x+5=32⇒ x=27
 ⇒ x∈ {3,11,19,27}
C= {3,11,19,27}