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圆锥曲线定义的拓展（卡西尼卵形线）
Author:
梁航宇
GeoGebra
New Resources
近似值：有效數字
畫出對稱圖形
Fibonacci Clock
算柱 (兩位數)
兩組對邊相等的四邊形
Discover Resources
test
畢氏定理拼圖
volume
拋體運動
題3
Discover Topics
Geometric Distribution
Circle
Random Variables
Tree Diagrams
Expected Value