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椭圆的离心率
Author:
孟宝兴
GeoGebra
New Resources
畫出對稱圖形
画直线等分三角形的面积
拼砌四邊形
球体的体积推导（优化版）
兩位數除以一位數（一）
Discover Resources
容積盒子(加蓋)
Measuring Volume 2
angle
GGB9
Copy of 線性組合2 三角形
Discover Topics
Piecewise Functions
Right Triangles
Curve Sketching
Plane Figures or Shapes
Intersection