Question

Scrieti prin enumerarea multimea A={×€N| 12/2×-1 € N}

Answer 1

inseamna ca 2x-1 e divizor al lui 12..adica poate fi 1 2 3 4 6 12
2x-1=1,2x=2,x=1
2x-1=2,2x=3 impos
2x-1=3, 2x=4,x=2
2x-1=4, 2x=5 impos
2x-1=6, 2x=7 impos
2x-1=12, 2x=11 impos
Deci A={1,2}