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1+12+103+1004+...+10000...055=?


Răspuns :

1+
10+2+
100+3+
1000+4+
....
100000...(53 de zero)+55=
=(1+10+100+....+100000...(53 de zero))+(2+3+4+....+55)=
=111....1111(de 53 ori 1)+1539=
=1111111111..1112650( de 49 ori 1)