(+1)+(-3)+(+5)+(-7).+(+2005)+(-2007)+(+2009)+(-2011)=

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(+1)+(-3)+(+5)+(-7).+(+2005)+(-2007)+(+2009)+(-2011)=

(+1)+(-3)+(+5)+(-7).+(+2005)+(-2007)+(+2009)+(-2011)=
(+1)+(-3)+(+5)+(-7).+(+2005)+(-2007)+(+2009)+(-2011)=

(+1)+(-3)+(+5)+(-7).+(+2005)+(-2007)+(+2009)+(-2011)=
原式
= (1 - 3) + (5 - 7) + ...+ (2005 - 2007) + (2009 - 2011)
= (-2) + (-2) + ...+ (-2) + (-2)
= (-2) × 503
= -1006

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