其他 返回
天气预报 > 其他 > 椭圆中abc是怎样定义的
椭圆中abc是怎样定义的
更新时间： 2020-09-18 00:00:00  

1、2a是长轴长,也是椭圆中任意一点到两个焦点的距离之和；

2、2c是焦距,是两个焦点间的距离；

3、2b是短轴长,满足b²=a²-c²。

关键词： 椭圆 abc 怎样 定义

椭圆中abc是怎样定义的相关经验

天气预报

最新推荐

页面:/news/view-2586509/ | 耗时:0.3770 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=2586509 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2586509 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2586509 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1102630,1066003,1114236,1110081,1101921,1047309,1103386,1045805,1085888,1084307,1089237,988905,1054991,1063671,1065221,1067966,1070498,1345992,1059515,1044673,1048788,1063735,1115699,1064643,1131105,1107261,1130714,1053308,1046963,1049870) ORDER BY field (ArticleID,1102630,1066003,1114236,1110081,1101921,1047309,1103386,1045805,1085888,1084307,1089237,988905,1054991,1063671,1065221,1067966,1070498,1345992,1059515,1044673,1048788,1063735,1115699,1064643,1131105,1107261,1130714,1053308,1046963,1049870)