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第一種方法--用四面體可推導球的體積公式http://tsmschool.com/Laojialeyuan/WebBook/gao/0/0245b/245b_jxkp_2.htm 第二種方法--球體積公式的極限法推導 http://www.gdmzzx.com/jszy/shuxuewu/ztyj/tjgs.doc
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