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椭圆的定义
Author:
guomenglin
Topic:
Ellipse
GeoGebra
New Resources
兩組對邊相等和有直角的四邊形
三位數除以一位數（二）
畫出對稱圖形
兩位數加法
四邉形 (四年級) 教師版
Discover Resources
task1
小數試用
封閉區域著色
容積盒子(加蓋)
圖D
Discover Topics
Expected Value
Right Triangles
Normal Distribution
Rhombus
Cuboid