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可拖动A、B 改变形状
Author:
孟宝兴
GeoGebra
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三位數除以一位數（二）
画直线等分三角形的面积
四邊形的特性
找出對稱軸
兩位數加法
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proof50 劉邦佑
題二
雙曲線1-焦點法
任意四边形各边中点的连线必构成平行四边形.许兴华数学
五年級_立體圖形_角錐展開圖
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Sequences and Series
Trigonometric Functions
Similarity Transformation or Similarity
Numbers
Statistical Characteristics