Question

A={x € N | x+2/x-1 apartine lui N}
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Answer 1

Răspuns:

A={x∈N | (x+2) / (x-1) ∈ N}

(x+2) / (x-1) ∈ N => {x-1 | x+2

{x-1 | x-1 (-)

=>x-1 | 3

x-1 ∈ D3

x-1 ∈ {1;3} |+1

x ∈ {2;4} => A={2;4}

sper ca e bine