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Byabiank03
a fost răspuns

Calculati suma 8+98+998+...999...98.[de 100 de ori 9]

Răspuns :

Albastruverde12
S=8+98+998+...+999...98=(10-2)+(100-2)+(1000-2)+...+(100...0-2) (de 101 ori 0) = (10+100+1000+...+1000...0)-(2+2+2+...+2) [101 de 2]=111...1-202 [102 de 1].

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