点学网

向量的四种写法

昔有孔乙己掌握“茴”字的四种写法，今有小编掌握向量的四种写法，谁更胜一筹？

三角形内心向量公式的推导

今天有人问我道数学题，题目很简单：设点是的内心，分别是对应边的长度，证明

基本文件流程错误 SQL 调试

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CONNECT:[ UseTime:0.003014s ] mysql:host=127.0.0.1;port=3306;dbname=dimhok;charset=utf8
SHOW FULL COLUMNS FROM `edu_coursetype` [ RunTime:0.002944s ]
SELECT * FROM `edu_coursetype` WHERE ( parent=0 ) ORDER BY `listorder` ASC [ RunTime:0.001779s ]
SELECT * FROM `edu_coursetype` WHERE ( parent='1' ) ORDER BY `listorder` ASC [ RunTime:0.001487s ]
SELECT * FROM `edu_coursetype` WHERE ( parent='2' ) ORDER BY `listorder` ASC [ RunTime:0.002233s ]
SHOW FULL COLUMNS FROM `edu_book` [ RunTime:0.002355s ]
SELECT * FROM `edu_book` WHERE `publish_time` >= 1748498377 [ RunTime:0.002316s ]
SHOW FULL COLUMNS FROM `edu_video_course` [ RunTime:0.001785s ]
SELECT * FROM `edu_video_course` WHERE `addtime` >= 1748498377 [ RunTime:0.000998s ]
SHOW FULL COLUMNS FROM `edu_nav` [ RunTime:0.001359s ]
SELECT * FROM `edu_nav` ORDER BY `sort_order` ASC [ RunTime:0.001029s ]
SHOW FULL COLUMNS FROM `edu_article_category` [ RunTime:0.001434s ]
SELECT * FROM `edu_article_category` ORDER BY `sort` ASC [ RunTime:0.000985s ]
SELECT * FROM `edu_article_category` WHERE `pid` = 1 AND `status` = 1 [ RunTime:0.001117s ]
SELECT * FROM `edu_book` ORDER BY rand() LIMIT 3 [ RunTime:0.002149s ]
SHOW FULL COLUMNS FROM `edu_article_tags` [ RunTime:0.001505s ]
SELECT `article_id` FROM `edu_article_tags` WHERE `tag_id` = 9 [ RunTime:0.000787s ]
SHOW FULL COLUMNS FROM `edu_article` [ RunTime:0.001491s ]
SELECT * FROM `edu_article` WHERE `id` IN (2,3) AND `is_draft` = 0 AND `is_open` = '1' ORDER BY `likes` DESC LIMIT 0,10 [ RunTime:0.001493s ]
SHOW FULL COLUMNS FROM `edu_users` [ RunTime:0.001921s ]
SELECT * FROM `edu_users` WHERE `id` = 2 [ RunTime:0.001200s ]
SELECT `edu_article_category`.*,`pivot`.`id` AS `pivot__id`,`pivot`.`article_id` AS `pivot__article_id`,`pivot`.`tag_id` AS `pivot__tag_id` FROM `edu_article_category` INNER JOIN `edu_article_tags` `pivot` ON `pivot`.`tag_id`=`edu_article_category`.`id` WHERE `pivot`.`article_id` IN ('2','3') [ RunTime:0.001555s ]
SHOW FULL COLUMNS FROM `edu_article_comment` [ RunTime:0.002007s ]
SELECT COUNT(*) AS think_count FROM `edu_article_comment` WHERE `article_id` = 2 LIMIT 1 [ RunTime:0.000943s ]
SHOW FULL COLUMNS FROM `edu_article_likes` [ RunTime:0.001719s ]
SELECT * FROM `edu_article_likes` WHERE `article_id` = 2 AND `uid` = 0 LIMIT 1 [ RunTime:0.000989s ]
SELECT COUNT(*) AS think_count FROM `edu_article_comment` WHERE `article_id` = 3 LIMIT 1 [ RunTime:0.001149s ]
SELECT * FROM `edu_article_likes` WHERE `article_id` = 3 AND `uid` = 0 LIMIT 1 [ RunTime:0.000627s ]
SELECT * FROM `edu_article_category` WHERE `pid` = 0 AND `status` = 1 ORDER BY `sort` ASC [ RunTime:0.000790s ]

0.186667s