曲线过某一点的切线方程如何求

页面:/news/view-164544/ | 耗时:1.0174 s | 内存:1.89 MB | 查询:4 | 缓存读取:4 写入:0 | 加载文件:23
select * from tbl_Articles WHERE ArticleID=164544 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=164544 LIMIT 0,1
select * from tbl_Articles_sphinx where id=164544 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1079606,1072625,1102206,1048712,1044877,1093154,1071131,1112730,1100537,1492702,1055405,1083461,1084909,1053308,1074306,1063309,1084471,1083141,1087912,1098107,1106232,1083208,1095520,1111930,1105159,1055920,1102770,1111130,1077533,1049510) ORDER BY field (ArticleID,1079606,1072625,1102206,1048712,1044877,1093154,1071131,1112730,1100537,1492702,1055405,1083461,1084909,1053308,1074306,1063309,1084471,1083141,1087912,1098107,1106232,1083208,1095520,1111930,1105159,1055920,1102770,1111130,1077533,1049510)