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GeoGebra
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Author:
chen mingchuan
GeoGebra
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球体的体积推导（优化版）
【案例】圆柱体内放置一个大球六个小球
找出對稱軸
【案例】2013年安徽高考15题
拼砌四邊形
Discover Resources
七巧板奔人3
橢圓
I love Taiwan.(可縮放和移動)
Pyramid with square base (angle between planes)
探究三角形的全等條件