Question

determinati multimile : A={ x apartinr lui N \ ( x + 1 ) | 5 }

Answer 1

(x+1) | 5, x apartine N , | inseamna divide

D5=1,5

 a)
(x+1)=1=>x=1-1=>x=0
(0+1) |5=>1 | 5

b)
(x+1)=5=>x=5-1=>x=4
(4+1) |5=>5|5