Răspuns :
aba= 100a +10b +a
aba= 100a + 10*2a+a= 100a+20a+a= 121a
121a= 11 * 11a : 11 (trebuiau 3 puncte)
aba= 100a + 10*2a+a= 100a+20a+a= 121a
121a= 11 * 11a : 11 (trebuiau 3 puncte)
aba=100a+10b+a
aba=100a+10*2a+a
=100a+20a+a=121a
121a= 11*11a *** 11 (cele 3 puncte - divizibil)
aba=100a+10*2a+a
=100a+20a+a=121a
121a= 11*11a *** 11 (cele 3 puncte - divizibil)