(+1)+(-2)+(+3)+(-4)+(+5)+(-6)+...+(+2011)+(-2012)
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/05 12:33:37
![(+1)+(-2)+(+3)+(-4)+(+5)+(-6)+...+(+2011)+(-2012)](/uploads/image/z/1006883-35-3.jpg?t=%28%2B1%29%2B%28-2%29%2B%28%2B3%29%2B%28-4%29%2B%28%2B5%29%2B%28-6%29%2B...%2B%28%2B2011%29%2B%28-2012%29)
(+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