★◆★高中数学试题专贴

实质是求内切球的大圆的半周长。
用等体积法可求得内切球半径R=(２－√2)/2
圆心O在平面PAC内

下面均是天边yyzz的女儿问我的问题（6道题），如果看不懂，晚上21:30以后可以挂电话问我：

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回复 85# cqsbcqsb


    老师辛苦了，这么晚您还没有休息，我真的很感动file:///C:/Documents%20and%20Settings/ly/Application%20Data/Tencent/QQ/QQFace/OperationPath/1001.gif，孩子说跟您学 她自己有信心学好数学了，愿她的美梦成真，:D file:///C:/Documents%20and%20Settings/ly/Application%20Data/Tencent/QQ/QQFace/OperationPath/1014.png
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回复  cqsbcqsb
    老师辛苦了，这么晚您还没有休息，我真的很感动，孩子说跟您学 她自己有信心学好数 ...
天边yyzz 发表于 2012-8-29 13:00

不必客气，只要孩子能学到知识就好

（大连24中）2012～2013学年度上学期高三年级期中考试Ⅰ数学科试卷
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答案下周发上来

（大连24中）2012～2013学年度上学期高三年级期中考试Ⅰ数学科试卷答案
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2012-10-29 23:26 上传

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