abc+bc+c=989
--------------------
a=?b=?c=?
(a*100+b*10+c)+(b*10+c)+c=980
a*100+2b*10+3c=980
9*100+8*10+9=989
900+80+9=989.................=>
a=900 =>a=900:1... =>a=900
2b=80....=>b=80:2 =>b=40
3c=9......=>c=9:3 =>c=3................si avem:
abc=900+40+3
=943
bc=40+3
=43
c=3.......=>
abc+bc+c=989
943+43+3=
=986+3
=989
