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Calculați sumele :
S1 = 1+2+3+....+79
S2 = 1+2+3+....+500


Răspuns :

Se foloseste suma gauss

[tex]S1 = 1 + 2 +...+79 = \frac{79*80}{2} = 79 * 40 = 3160\\\\ S2 = 1+2+3+....+500 = \frac{500*501}{2} = 250 * 501 = 125250[/tex]