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Calculati suma:
S=9+99+999.....+99.....9=1996 cifre.


Răspuns :

S=1+9+1+99+1+999+.......+1+9999...9-1*1996
S=10+100+1000+10.000+....+1000000-1996
S=111111111...de1996 ori...11110-1996
S=111111..de..992 ori..1109114