Question

Aflati x e N pentru care numarul rational 18 supra 2x+1 , este natural !
Urgent !

Answer 1

18 supra x+1=>(x+1) divizibil cu 18=>(x+1) apartine D18=>(x+1) apartine {1;2;3;6;9;18}
x+1=1=>x=0
x+1=2=>x=1
x+1=3=>x=2
x+1=6=>x=5
x+1=9=>x=8
x+1=18=>x=17