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Calculati urmatoarele sume:

b) 1+2+3+.....500=


Răspuns :

=(500x501):2=250.500:2=125.250

1 + 2 + 3 + ....... + 500 = 125 250

= 500 × ( 1 + 500 ) / 2 = → aplic formula sumei lui Gauss

= 250 × 501 =

= 125 250