最新提问
我的动态
登录后查看动态
题目内容双击单词支持查询和收藏哦～
List A: 1，-2，3，-4，5，-6…
In the list above, the absolute value of every number is 1 greater than the absolute value of the former number, in positive and negative in turn. What is the sum of the first 99 numbers?
50 显示答案
以上解析由 考满分老师提供。
