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Author:
chen mingchuan
GeoGebra
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四邊形的特性
兩位數除以一位數（一）
拼砌四邊形
算柱 (兩位數)
錐體建築師
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橢圓尺規作圖Ex01
分數比較
畢氏定理
圓錐曲線與平行四邊形定理
变化的三角形的外心.许兴华数学
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Integers
Differential Equation
Trapezoid
Incircle or Inscribed Circle
Expected Value