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约瑟夫问题
Author:
孟宝兴
GeoGebra
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四邉形 (四年級) 教師版
三位數除以一位數（二）
四邊形的特性
球體建築師
GeoGebra笔记功能体验课件
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Quiz on Solving Right Triangles (Finding Side Lengths) 解直角三角形：測驗1（求邊長）
Transformation of Functions
如何求切線長
GGB1
直纹面单叶
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Ratios
Geometric Transformations
Straight Lines
Surface
Orthocenter