天气预报 > 其他 > 从1到100等于几
从1到100等于几
更新时间: 2020-07-13 00:00:00  

1加2加3加到100等于5050,等差数列求和:n乘以(n加1)除以2等于100乘以101除以2等于5050。高斯算法:(1加100)加(2加99)加到(50加51)等于101乘以50等于5050,结果等于5050。

具体的方法是:首项加末项乘以项数除以2,项数的计算方法是末项减去首项除以项差(每项之间的差)加1。

关键词: 等于

从1到100等于几相关经验

天气预报

最新推荐

页面:/news/view-2301933/ | 耗时:0.6201 s | 内存:2.11 MB | 查询:4 | 缓存读取:3 写入:0 | 加载文件:25
select * from tbl_Articles WHERE ArticleID=2301933 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2301933 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2301933 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(269789,2035654,1117077,1301515,1102032,1128359,1445704,208727,636101,1796561,2183414,1586512,1534772,1127407,1133157,474101,1103204,3282336,132421,1079682,1694581,2298922,238430,881737,257124,113610,1787094,1502649,528920,1616070) ORDER BY field (ArticleID,269789,2035654,1117077,1301515,1102032,1128359,1445704,208727,636101,1796561,2183414,1586512,1534772,1127407,1133157,474101,1103204,3282336,132421,1079682,1694581,2298922,238430,881737,257124,113610,1787094,1502649,528920,1616070)