Question

determinati elementele multimi a egal acolada x ,,semnul de la euro,, n bara 15 supra x minus 2 ,,semnul de la euro,, n acolada

Answer 1

ok....sa traducem...
A={x ∈ N| 15/(x-2) ∈ N}
15/(x-2) ∈N => x-2 ∈D15={1,3,5,15}
x-2=1 => x=3
x-2=3 => x=5
x-2=5 => x=7
x-2=15 => x=17
A={3,5,7,17}