Question

Exercițiul 3 plsssssssss

Answer 1

Poi....21/x+1
x=20
20+1=21
21/21=1
1= nr. nat.

Answer 2

21:x+1
x+1 apartine Divizorilor lui 21
x+1={1,3,7,21}
x={0,2,6,20}