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Claculati: 1001+2002+3003+4004+...+9009

VA ROG CAT MAI REPEDE!!!!!!!!!!!!!!!!!


Răspuns :

[tex]1001+2002+3003+4004+...+9009 = [/tex]
[tex] =1001*(1+2+3+...+9)[/tex]
[tex]=1001* \frac{9*(9+1)}{2}[/tex]
[tex]=1001* \frac{9*10}{2} [/tex]
[tex]=1001* \frac{90}{2} [/tex]
[tex]=1001*45[/tex]
[tex]=45045[/tex]