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Calculat.Dau coroana .Cu suma Gauss. 84+86+88+...+684

Răspuns :

S=84+86+...+684
S=684+682+...+84
_______________
2S=768+768+...+768=>601
84-->684=》684-84+1=601
2S=768×601
2S=461568/:2
S=230784