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同心圓+等分割線
Author:
許清惟
GeoGebra
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三位數除以一位數（二）
四邉形 (四年級) 教師版
第八周作业
畫出對稱圖形
柱體建築師
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阿基米德(4,6,6)
function3
Apollonius Problem 8 CLL homo 12
三圓外切
圈圈移動
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Definite Integral
Unit Circle
Hyperbola
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