(1+3+5······+2007+2009+2011)-(2+4+6+·····+2006+2008+2010)

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(1+3+5······+2007+2009+2011)-(2+4+6+·····+2006+2008+2010)(1+3+5······+2007+2009+2011)-(2+4+6+·····+2

(1+3+5······+2007+2009+2011)-(2+4+6+·····+2006+2008+2010)
(1+3+5······+2007+2009+2011)-(2+4+6+·····+2006+2008+2010)

(1+3+5······+2007+2009+2011)-(2+4+6+·····+2006+2008+2010)
1+3+5······+2007+2009+2011)-(2+4+6+·····+2006+2008+2010)
=1+(3-2)+(5-4)+、、、、、、+(2007-2006)+(2009-2008)+(2011-2010)
=1+1005
=1006

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