问道数学题

灌水区

Neil_Qian_ @ 2024-11-29 22:17:15

求|x−1|−|x−2|+|x−3|−|x−4|+...+|x−2019|−|x−2020|的最小值.

by CSPJ300_DRC1005 @ 2024-11-29 22:20:43

for循环不会?


by Neil_Qian_ @ 2024-11-29 22:25:08

@CSPJ300_DRC1005 数学方法不会


by dg114514 @ 2024-11-29 22:36:36

@NeilQian x=1010


by Controls_Wishes @ 2024-11-29 22:41:10

|x-1| 可看做数轴上一点到 1 的距离

同理,对于任意n,|x-n| 看做一点x到n的距离

然后就简单了


by Controls_Wishes @ 2024-11-29 22:45:22

答案应该是-1010 ,x<=1时取得


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