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Exercitiu : 28+35+42+......567=


Răspuns :

aflam numarul de termeni
(567-28)/7+1=
539/7+1=77+1=78 deci adunarea are 78 termeni
Acum ai suma lui Gauss

S=[78*(28+567)]/2
s=78*595/2
S=39*595=23205