数学趣闻知多少-畅读网

　　　　

数学趣闻知多少

作者：纸上魔方

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内容简介:

这是一套有趣的数学科普丛书，涉及美食、人体、医学、建筑、物理、军事、交通、古代数学等与数学相关的领域，内容包罗万象，故事生动有趣，是培养孩子数学兴趣和数学思维的绝佳读物。本套丛书运用生动活泼的文字、幽默诙谐的漫画以及贴近生活的例子，将复杂深奥的数学知识化繁为简，让孩子一看就明白，一学就会用！揭秘数学史上最深奥的谜？ “守株待兔”的原理？怎么破解鸡兔同笼？让人琢磨不透的七巧板？解密囚徒困境？ …… 与数学有关的趣闻，你知道多少呢？

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CONNECT:[ UseTime:0.002156s ] mysql:host=127.0.0.1;port=3306;dbname=mq;charset=utf8mb4
SHOW FULL COLUMNS FROM `ls_goods_category` [ RunTime:0.002745s ]
SELECT `id`,`name`,`pid`,`image`,`level`,`is_show`,`is_recommend` FROM `ls_goods_category` WHERE `is_show` = 1 AND `del` = 0 AND `level` = 1 ORDER BY `id` ASC,`sort` DESC [ RunTime:0.002451s ]
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SHOW FULL COLUMNS FROM `ls_nav` [ RunTime:0.004402s ]
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SHOW FULL COLUMNS FROM `ls_friendly_link` [ RunTime:0.009161s ]
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SHOW FULL COLUMNS FROM `ls_goods` [ RunTime:0.006540s ]
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SHOW FULL COLUMNS FROM `ls_ad` [ RunTime:0.004397s ]
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SELECT `id`,`name` FROM `ls_goods_category` WHERE `id` = 9 LIMIT 1 [ RunTime:0.002266s ]
SELECT `id`,`name` FROM `ls_goods_category` WHERE `id` = 70 LIMIT 1 [ RunTime:0.004309s ]
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:0.004081s ]
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:0.005563s ]
SELECT * FROM `ls_goods` WHERE `del` = 0 AND `status` = 1 AND `create_time` <= 1771628980 ORDER BY `create_time` DESC LIMIT 5 [ RunTime:1.833606s ]

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