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椭圆的光学性质
Author:
孟宝兴
GeoGebra
New Resources
錐體建築師
三位數除以一位數（二）
兩組對邊相等和有直角的四邊形
找出對稱軸
兩位數加法
Discover Resources
几何体
平行4
禪繞畫
Ex.2
IF指令定義域與值域範圍的限定
Discover Topics
Rectangle
Volume
Vectors 3D (Three-Dimensional)
Square
Constructions