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Cum se rezolva exercitiul:1+2+3+4+5+6+...+2013?

Răspuns :

1+2+3+4...+2013 = (2013· 2014 )/2 = 4054 182/2 = 2 027 091
1+2+3+4+.........+2013=2013x(2013+1):2=1006,5x2014=2027091