Question

scrieti multimea A={x/x ∈N,doi x + sapte mai mic sau egal decat douazeci} prin enumerarea tuturor elementelor

Answer 1

  A={x/x∈N,2x+6≤20}<=>A={2x≤20-6}<=>A={2x≤14}<=>A={x≤14:2}<=>A={x≤7}<=>A={0;1;2;3;4;5;6;7}