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Determina x numar natural astfel incat (x+1) divide (x+13).
Urgent!!


Răspuns :

(x+1) |  (x+13)
(x+1) | (x+1)

=> (x+1) | (x+13) - (x+1) 
(x+1) |  x+13-x-1
(x+1) |  12
=> (x+1) ∈{1,2,3,4,6,12}
=> x∈{0,1,2,3,5,11}