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三视图
Author:
肖昆明
GeoGebra
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判斷球體
球体的体积推导
球体的体积推导（优化版）
兩組對邊相等和有直角的四邊形
拼砌四邊形
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自製工具：「星星」
小數試用
優良作品3
兩位數除法
Remove a data
Discover Topics
Secant Line or Secant
Division
Constructions
Terms
Real Numbers