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2014-08-21T14:38:15+03:00
Aba= 100a +10b +a

aba= 100a + 10*2a+a= 100a+20a+a= 121a

121a= 11 * 11a  : 11  (trebuiau 3 puncte)
1 5 1
2014-08-21T15:58:30+03:00
Aba=100a+10b+a
aba=100a+10*2a+a
=100a+20a+a=121a
121a= 11*11a *** 11 (cele 3 puncte - divizibil)