(+1)+(+2)+(-3)+(-4)+(+5)+(+6)+(-7)+(-8)+...+(-11)+(-12)怎么算

来源：学生作业帮助网编辑：作业帮时间：2024/05/06 00:14:51

(+1)+(+2)+(-3)+(-4)+(+5)+(+6)+(-7)+(-8)+...+(-11)+(-12)怎么算
(+1)+(+2)+(-3)+(-4)+(+5)+(+6)+(-7)+(-8)+...+(-11)+(-12)怎么算

(+1)+(+2)+(-3)+(-4)+(+5)+(+6)+(-7)+(-8)+...+(-11)+(-12)怎么算
(+1)+(+2)+(-3)+(-4)+(+5)+(+6)+(-7)+(-8)+...+(-11)+(-12)
=1+2+5+6+9+10-3-4-7-8-11-12
=1-3+2-4+5-7+6-8+9-11+10-12
=-2-2-2-2-2-2
=-12

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+.