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折叠问题一例
Author:
孟宝兴
GeoGebra
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兩組對邊相等和有直角的四邊形
GeoGebra笔记功能体验课件
兩組對邊相等的四邊形
画直线等分三角形的面积
球体的体积推导（优化版）
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图形
仿生機械
兩向量的比
正方形內部
立體網狀圖
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Mode
Tree Diagrams
Logarithm
Kite
Differential Equation