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外心的位置
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謝定原
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柱體建築師
【案例】2013年安徽高考15题
拼砌四邊形
兩位數除以一位數（一）
異分母分數減法
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隨機迷宮
模擬3D---圓錐曲線的產生
單相感應電動機原理
Apollonius Problem 10 CCC wiki
GeoGebra
Tangent of circle
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Rectangle
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