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椭圆的定义
Author:
guomenglin
Topic:
Ellipse
GeoGebra
New Resources
球體建築師
畫出對稱圖形
異分母分數減法
拼砌四邊形
兩位數除以一位數（一）
Discover Resources
三角形的三心觀察站
CACTM對稱及變換
內外切圓性質
三角形外心
小四_分數
Discover Topics
Random Experiments
Random Variables
Normal Distribution
Geometric Mean
Expected Value