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calvulati: a=1+2+3+...498+499+500

Răspuns :

a=(T1+T2)×n:2
a=(1+500)×500:2
a=501×500:2
a=250.500:2
a=125.250
Metoda lui Gauss:

a=(1+500)×500:2=501×500:2=501×250=125250