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

来源:学生作业学帮网 编辑:学帮网 时间:2024/05/13 23:41:05

(+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