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轨迹20
Author:
万超杰
GeoGebra
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找出對稱軸
兩位數除以一位數（二）
錐體建築師
三位數除以一位數（二）
拼砌四邊形
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轨迹2016.4.16
gjh-h04-01 多個堆疊的直角三角形
面外一點
四點距離最小
雙曲線1-焦點法
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Statistics
Secant Line or Secant
Congruence
Quadratic Functions
Means