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三角形的外心
Author:
侯杰材
GeoGebra
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【案例】2013年安徽高考15题
三位數除以一位數（一）
判斷球體
第八周作业
【案例】圆柱体内放置一个大球六个小球
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謝丞宇
三角形外心探討
IMO2015D
椭圆的定义的副本
Hamid Naderi Yeganeh segment3
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Random Experiments
Incircle or Inscribed Circle
Normal Distribution
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