中国几何故事-畅读网

　　　　

中国几何故事

作者：许莼舫

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《中国几何故事》由著名数学教育家许莼舫所著，以故事的形式从几何知识的起源开篇，介绍了圆周率的沿革，洞渊的勾股测圆术，语言幽默风趣。书中详细地讲解了生活中和学习中测量和解决实际问题的技巧，如：中国三角测量的方法，求积的新贡献，体积还原和截积术，平面和球面三角学上的创造。不但讲透几何基础知识，补充必要知识开拓眼界，还运用大量的例题举一反三，为进一步深入学习几何创造了条件。《中国几何故事》汇聚了中国数学家自古的卓著成就，内容通俗易懂，没有高深的理论，是学习几何的好帮手。

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SELECT `id`,`name` FROM `ls_goods_category` WHERE `id` = 5 LIMIT 1 [ RunTime:0.000706s ]
SELECT `id`,`name` FROM `ls_goods_category` WHERE `id` = 48 LIMIT 1 [ RunTime:0.000853s ]
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:0.001073s ]
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:0.001148s ]
SELECT * FROM `ls_goods` WHERE `del` = 0 AND `status` = 1 AND `create_time` <= 1747724494 ORDER BY `create_time` DESC LIMIT 5 [ RunTime:0.568820s ]

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