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椭圆的定义
Author:
guomenglin
Topic:
Ellipse
GeoGebra
New Resources
異分母分數減法
兩組對邊相等和有直角的四邊形
畫出對稱圖形
找出對稱軸
判斷球體
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Angles in the Circumference and the Centre
Conic Sections
角平分線
BkD_act15_03c
gjc102a14 三角形內的高
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Special Points
Scalene Triangles
Square
Limits
Triangles