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圆锥曲线折纸操作题（教材案例）
Author:
蔡永志
Topic:
Conic Sections
,
Ellipse
,
Hyperbola
GeoGebra
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兩組對邊相等和有直角的四邊形
兩組對邊相等的四邊形
GeoGebra笔记功能体验课件
四邉形 (四年級) 教師版
【案例】2013年安徽高考15题
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圓柱截痕
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直角坐標的旋轉變換
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