______
abcabc = 100.000a+10.000b+1.000c+100a+10b+c =
= 100.100a+10.010b+1.001c =
= 1.001(100a+10b+c) [tex]\vdots\;13\;\;pentru\;ca\;\;1001\;\vdots\;13\;!!![/tex]
