Question

B={x|x€N,x-2|10} rezolva multimea!

Answer 1

x-2∈D10
D10={1,2,5,10}
x-2∈{1,2,5,10}
x∈{3,4,7,12}
B={3,4,7,12}

Mult succes! ^-^

Answer 2

x-2 | 10 => x-2 € divizorilor lui 10
x-2 € {1,2,5,10} /+2
x € {3,4,7,12}
=> B € {3,4,7,12}