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2+4+6+8+10 +..................1000..Rezolva exercitiul ...!!!!

Răspuns :

[tex]2+4+6+8+...+1000=2(1+2+3+4+...+500)=2* \frac{500*501}{2}=[/tex][tex]500*501=250500[/tex]
2(1+2+3+4+5+.......500)=2X[(500X501)/2]=500X501=250500