Question

Aflati x apartine Z rezulta 18 supra x-15 apartine Z

Answer 1

18/x-15∈Divizorilor lui 18={1,2,3,6,9,18}

x-15=1
x=1+15
x=16

x-15=2
x=2+15
x=17
 
x+15=3
x=3+15
x=18

x-15=6
x=6+15
x=21

x-15=9
x=9+15
x=24

x-15=18
x=18+15
x=33

x∈{16,17,18,21,24,33}