{1}1-2-3+4+5-6-7+8+9-10-11...-2007+2008+2009-2010-2011+2012=________ {2}(-3又1/3)-(+1/2)+(+4又3/4)-(-1又2/3) =

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{1}1-2-3+4+5-6-7+8+9-10-11...-2007+2008+2009-2010-2011+2012=________{2}(-3又1/3)-(+1/2)+(+4又3/4)-(-1又

{1}1-2-3+4+5-6-7+8+9-10-11...-2007+2008+2009-2010-2011+2012=________ {2}(-3又1/3)-(+1/2)+(+4又3/4)-(-1又2/3) =
{1}1-2-3+4+5-6-7+8+9-10-11...-2007+2008+2009-2010-2011+2012=________ {2}(-3又1/3)-(+1/2)+(+4又3/4)-(-1又2/3) =

{1}1-2-3+4+5-6-7+8+9-10-11...-2007+2008+2009-2010-2011+2012=________ {2}(-3又1/3)-(+1/2)+(+4又3/4)-(-1又2/3) =
第一个是2012