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椭圆的光学性质
Author:
孟宝兴
GeoGebra
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三位數除以一位數（二）
兩位數除以一位數（二）
畫出對稱圖形
兩組對邊相等和有直角的四邊形
找出對稱軸
Discover Resources
Relationships between chords and their distances from centre
slide
圓上的角任務(三): 提示卡
聖者即正義
F4_Ch9.1 任意角的三角比
Discover Topics
Cuboid
Reflection
Trapezoid
LCM and GCD
Quadratic Equations