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椭圆的定义

Author:guomenglin

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球體建築師
畫出對稱圖形
兩位數除以一位數（二）
sanjiaohanshu
三位數除以一位數（一）

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龍騰4_1-1習10
弦切角是圓心角的一半
以剪貼比較圖形大小題1
垂心問題
小六_容量與體積問題

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Planes
Secant Line or Secant
Intersection
Area
Vectors 2D (Two-Dimensional)

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