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兩圓內外公切線
Author:
梅
GeoGebra
New Resources
拼砌四邊形
兩位數除以一位數（二）
算柱 (兩位數)
錐體建築師
找出對稱軸
Discover Resources
七巧板
Conic section-ellipse&hyperbola
立體三角測量(例六)
畢氏定理(等面積變形法)
算幾不等式
Discover Topics
Polygons
Addition
Ellipse
Conditional Probability
Cuboid