Question

am nevoie de ajutor enumerati elementele multimilor​

Answer 1

Răspuns:

E={ x∈ Z| -3|x si |2x-1| <19}

|2x-1| <19 => -19<2x-1<19 |+1 <=> -18<2x<20| :2 <=> -9<x<10

                                                  cum -3|x si x∈Z

=> x∈{-6;-3;0;3;6;9} = E

F={ x∈Z| 13/x+2 ∈ N}

13/x+2 ∈ N => x+2 |13 => x+2 ∈ D₁₃={1;13} |-2 => x∈{-1;11}=F