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一线三等角模型
Author:
辛贺华
GeoGebra
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拼砌四邊形
四邉形 (四年級) 教師版
畫出對稱圖形
兩位數加法
判斷球體
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畫三角形 題2b
反正弦函數
畢氏定理
雙曲線3 等軸法
根據百分率找數量（二）: 例1的副本
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Planes
Integral Calculus
Matrices
Polynomial Functions
Hypothesis Testing