天气预报 > 其他 > 2+4+8加到98是多少
2+4+8加到98是多少
更新时间: 2020-10-29 00:00:00  

2+4+8加到98是2450。算法:2+4+6+8+……+98=(2+98)×49÷2=100×49÷2=4900÷2=2450。这是一个等差数列。

等差数列是指从第二项起,每一项与它的前一项的差等于同一个常数的一种数列,常用A、P表示。这个常数叫做等差数列的公差,公差常用字母d表示。

关键词: 多少

2+4+8加到98是多少相关经验

天气预报

最新推荐

页面:/news/view-1425240/ | 耗时:0.6573 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=1425240 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1425240 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1425240 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1047411,1084249,1062018,1051283,1064097,1067241,1027455,1059515,1061838,1085376,1085906,1081181,1298135,1086063,1053308,1067617,1064601,1084437,1041317,1117904,1048878,1086312,1049398,1085864,1075688,1112398,1070270,1087237,1070050,1073407) ORDER BY field (ArticleID,1047411,1084249,1062018,1051283,1064097,1067241,1027455,1059515,1061838,1085376,1085906,1081181,1298135,1086063,1053308,1067617,1064601,1084437,1041317,1117904,1048878,1086312,1049398,1085864,1075688,1112398,1070270,1087237,1070050,1073407)