1+2-3-4+5+6-7-8+9+10-11-12······-2003-2004+2005+2006-2007-2008+2009+2010=?

1+2-3-4+5+6-7-8+9+10-11-12······-2003-2004+2005+2006-2007-2008+2009+2010=?=（1-3)+(2-4）+（5-7）+（6-8）.+(2006-2008)+2009+2010=-2*(2008÷2)+2009+2012-2008+2009+2010=2011

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