思考的乐趣:Matrix67数学笔记-畅读网

　　　　

思考的乐趣:Matrix67数学笔记

作者：顾森

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顾森编著的《思考的乐趣》内容大多是从作者6年多以来积累的上千篇博客中节选而来的，分为“生活中的数学”、“数学之美”、“几何的大厦”、“精妙的证明”和“思维的尺度”五部分。书中基本不涉及高深的数学理论，但是内容新颖、时尚，既有与现实生活联系紧密的应用型话题，又有通几何、代数联系的富有启发性的讨论，还间或介绍了一些著名数学难题的*新研究展，信息十分丰富。?《思考的乐趣》是广大数学爱好者的美味佳肴，只要具备简单数学基础即能阅读。

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SELECT `id`,`name` FROM `ls_goods_category` WHERE `id` = 5 LIMIT 1 [ RunTime:0.004018s ]
SELECT `id`,`name` FROM `ls_goods_category` WHERE `id` = 46 LIMIT 1 [ RunTime:0.004824s ]
SELECT `a`.*,`ap`.`width`,`ap`.`height` FROM `ls_ad` `a` INNER JOIN `ls_ad_position` `ap` ON `a`.`pid`=`ap`.`id` WHERE `pid` = 11 AND `ap`.`client` = '2' AND `a`.`status` = '1' AND `a`.`del` = '0' AND `ap`.`status` = '1' AND `ap`.`del` = '0' ORDER BY `sort` DESC,`id` DESC [ RunTime:0.004582s ]
SELECT `a`.*,`ap`.`width`,`ap`.`height` FROM `ls_ad` `a` INNER JOIN `ls_ad_position` `ap` ON `a`.`pid`=`ap`.`id` WHERE `pid` = 14 AND `ap`.`client` = '2' AND `a`.`status` = '1' AND `a`.`del` = '0' AND `ap`.`status` = '1' AND `ap`.`del` = '0' ORDER BY `sort` DESC,`id` DESC [ RunTime:0.005082s ]
SELECT * FROM `ls_goods` WHERE `del` = 0 AND `status` = 1 AND `create_time` <= 1762412354 ORDER BY `create_time` DESC LIMIT 5 [ RunTime:1.856271s ]

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