(+1)+(-2)+(+3)+(-4)+(+5)+(-6)+...+(+2011)+(-2012)

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(+1)+(-2)+(+3)+(-4)+(+5)+(-6)+...+(+2011)+(-2012)
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(+1)+(-2)+(+3)+(-4)+(+5)+(-6)+...+(+2011)+(-2012)
(+1)+(-2)+(+3)+(-4)+(+5)+(-6)+...+(+2011)+(-2012)

(+1)+(-2)+(+3)+(-4)+(+5)+(-6)+...+(+2011)+(-2012)
(+1)+(-2)+(+3)+(-4)+(+5)+(-6)+...+(+2011)+(-2012)
=1-2+3-4+5-6+……………………+2011-2012
=（2012/2）*（-1）
=1006*(-1)
=-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+.