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aratati ca
---- aa:11


Răspuns :

a=a; a e nr de 2 cifre => 11,22,33,44,55,66,77,88,99
11 | 11...99 
[tex]\overline{aa}=10a+a=11a \\ 11\ |\ 11a\ \forall\ a\in\ Z[/tex]