几何明珠-畅读网

　　　　

几何明珠

作者：黄家礼

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mobi/epub/pdf/awz3

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科学技术 >> 科普读物

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内容简介:

该书以著名的平面几何定理为素材，系统地介绍了这些定理的历史渊源及各种巧妙简捷的证明与解法，得出许多美妙有趣的引申和推广，并挖掘出这些定理在解题中的一些典型新颖的应用。全书内容丰富、通俗易懂、深入浅出、妙趣横生，对激发兴趣，锻炼机敏的思维能力将大有裨益。本书可作为大、中学生的课外读物，也可作为中学数学教师的教学参考资料。该书第一版于1997年由科学普及出版社出版，并获2001年湖北省优秀论著一等奖；第二版于2000年由台湾九章出版社出版。

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CONNECT:[ UseTime:0.000835s ] mysql:host=127.0.0.1;port=3306;dbname=mq;charset=utf8mb4
SHOW FULL COLUMNS FROM `ls_goods_category` [ RunTime:0.001253s ]
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:0.000975s ]
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SELECT `id`,`name`,`pid`,`image`,`level`,`is_show`,`is_recommend` FROM `ls_goods_category` WHERE `is_show` = 1 AND `del` = 0 AND `level` = 3 ORDER BY `sort` DESC [ RunTime:0.000895s ]
SHOW FULL COLUMNS FROM `ls_nav` [ RunTime:0.001379s ]
SELECT `id`,`name`,`pid`,`image`,`level`,`link`,`module`,`is_show`,`is_recommend` FROM `ls_nav` WHERE `is_show` = 1 AND `del` = 0 AND `level` = 1 ORDER BY `id` ASC,`sort` DESC [ RunTime:0.000743s ]
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SHOW FULL COLUMNS FROM `ls_friendly_link` [ RunTime:0.001225s ]
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SHOW FULL COLUMNS FROM `ls_goods` [ RunTime:0.001210s ]
SELECT * FROM `ls_goods` WHERE `id` = 151517 AND `status` = 1 LIMIT 1 [ RunTime:0.000817s ]
UPDATE `ls_goods` SET `click_count` = 117 , `update_time` = 1747259095 WHERE `id` = 151517 [ RunTime:0.000756s ]
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SHOW FULL COLUMNS FROM `ls_ad` [ RunTime:0.001171s ]
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SELECT `id`,`name` FROM `ls_goods_category` WHERE `id` = 5 LIMIT 1 [ RunTime:0.000700s ]
SELECT `id`,`name` FROM `ls_goods_category` WHERE `id` = 46 LIMIT 1 [ RunTime:0.000668s ]
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:0.000981s ]
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:0.001020s ]
SELECT * FROM `ls_goods` WHERE `del` = 0 AND `status` = 1 AND `create_time` <= 1747259035 ORDER BY `create_time` DESC LIMIT 5 [ RunTime:0.471656s ]

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