(+1)+(-2)+(+3)+(-4)+.+(+2011)+(-2012)用简便方法计算

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(+1)+(-2)+(+3)+(-4)+.+(+2011)+(-2012)用简便方法计算
(+1)+(-2)+(+3)+(-4)+.+(+2011)+(-2012)用简便方法计算

(+1)+(-2)+(+3)+(-4)+.+(+2011)+(-2012)用简便方法计算
(+1)+(-2)+(+3)+(-4)+.+(+2011)+(-2012)
=[ (+1)+(-2)]+[(+3)+(-4)]+.+[(+2011)+(-2012)]
=-1 + ...(-1)
= - 2012/2 = -1006

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