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與兩圓相切之圓心雙曲線軌跡
Author:
Bennie Liu
GeoGebra
New Resources
三位數除以一位數（一）
拼砌四邊形
異分母分數減法
四邉形 (四年級) 教師版
找出對稱軸
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北區模考非選第二題 (2014.03.06)
利用對摺找內心
音調與空氣柱
鏡射的副本
乘法计时训练
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Translation
Root
Surface
Planes
Rectangle