Question

Determinati multimile
A={x/x apartine N si 3/x}
B={x/xapartine N*si x+1apartine D18
C={x apartine D10 si x+2 apartine D12
D={x apartine M10 si x-4 apartine D26
VA ROG SA MA AJUTATI IMI TREBUI NEAPARAT!

Answer 1

A={0,3,6,9,12,15,18..}= M3

x+1 ∈ {1,2,3,6,9,18}⇒ x∈{1,2,5,8,17}⇒ B={1,2,5,8,17}

x∈{1,2,5,10} si x+2 ∈ {1,2,3,4,6,12}⇒ x∈{1,2,10}⇒ C={1,2,10}

x-4∈ {1,2,13,26}⇒ x∈{5,6,17,30} si x∈M10⇒ D={30}