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公切線長度的計算的副本
Author:
xiaodandan
,
曾己泉
外公切線與內公切線的描述及計算
GeoGebra
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判斷球體
畫出對稱圖形
兩位數除以一位數（一）
錐體建築師
兩位數加法
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fixed arc length and fixed shaded area
時鐘與數學
轉盤送分遊戲
Twghmkc_運動與我
coterminal angles
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Sphere
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