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任务2：勾股定理
Author:
陈丽婷
GeoGebra
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柱體建築師
兩組對邊相等的四邊形
三位數除以一位數（二）
四邉形 (四年級) 教師版
兩組對邊相等和有直角的四邊形
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反餘弦函數
畢式定理 (12)
cosine graph 變換
矩形
工作紙-整數乘以真分數
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Means
Conic Sections
Equations
Cube
Optimization Problems