(+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)+(+

(+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

1 2 3 4 1 2 3 4 1 2 3 4 1,2,3,4, 1 2 3 4 1 2 3 4 1,2,3,4, 1,2,3,4, 1,2,3,4, 1,2,3,4, 1 2 3 4 1,2,3,4, 1,2,3,4, 1,2,3,4, 1、2、3、4 1+2+3×4 1,2,3,4 1+2+3+4+.