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12aniamdoar
a fost răspuns

cum să rezolv 7+9+11+...+2013-5-7-9...-2011

Răspuns :

7 + 9 + 11 + ... + 2013 - 5 - 7 - 9 - ... - 2011=
=(7+9+11+...2011)+2013 - 5 - (7+9+11+...+2011)=
=2013 - 5
= 2008
Rayzen
7+9+11+...+2013-5-7-9-11-...-2011 =
= 7+9+11+...+2011+2013-5-7-9-11-...-2011 =
= 7+9+11+...+2011+2013-5-(7+9+11+...+2011)=
= 7+9+11+...+2011-(7+9+11...+2011 )+2013-5 =
= 2013-5 = 2008

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