Question

{x|x€ N și 13 <x - 1 <90};​

Answer 1

Răspuns:

13<x-1<90

13<x<90-1

13<x<89

x=14, 15, 16, 17, 18, 19, 20, ....., 86, 87, 88.

{14, 15, 16, 17, 18, 19, 20, ....., 86, 87, 88}