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选修一P115-8求距离比为定值的动点轨迹(第二定义)
Author:
jjx01
Topic:
Conic Sections
,
Ellipse
GeoGebra
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柱體建築師
拼砌四邊形
sanjiaohanshu
兩位數除以一位數（二）
三位數除以一位數（一）
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利用按鈕控制動畫On/Off
對稱圖形
ie 7
周界平移
探究余弦定理
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Set Theory
Cone
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Curve Sketching