UC知道(+1)+(-2)+(+3)+(-4)+...+（+99)+(-100)
来源：百度知道 编辑：UC知道 时间：2024/09/24 22:13:49
-50
1-2=-1 3-4=-1 100除以2=50
50乘以-1=-50
=(1+3+5....+99)-(2+4+.....+100)
=(1+99)*50/2-(2+100)*50/2
=-50
(+1)+(-2)+
(+3)+(-4)+
(+5)+(-6)+
..........
+（+99)+(-100)
=-1-1-1...-1
=-50
=(1+3+5....+99)-(2+4+.....+100)
=(1+99)*50/2-(2+100)*50/2
=-50
(+1)+(-2)+
(+3)+(-4)+
(+5)+(-6)+
..........
+（+99)+(-100)
=-1-1-1...-1
=-50
(+1)+(-2)+(+3)+(-4)+...+（+99)+(-100)
=(1-2）+（3-4）+...+(99-100)
=-1*50
=-50