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Calculati : -2-4-6-...-2000

Răspuns :

[tex]S=-2(1+2+3+...+1000)= \\ \\ ~~~=-2 \cdot \frac{1000 \cdot 1001}{2}= \\ \\ ~~~=-1000 \cdot 1001= \\ \\ ~~~=\boxed{-1001000} [/tex]
S=-2(1+2+3+...+1000) = (-2x1000x1001)/2 = -1001x1000 = -1001000