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平面鏡成像 Image of Plane Mirror Reflection
Author:
W.L. Wong, Albert
GeoGebra
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兩位數除以一位數（一）
兩位數加法
三位數除以一位數（一）
兩組對邊相等和有直角的四邊形
【案例】圆柱体内放置一个大球六个小球
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判斷柱體 9
Testing 20170308
滑桿按鈕輸入框
圓錐截痕
【高中物理】双电荷电势分布立体图
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Polygons
General Quadrilateral
Means
Parametric Curves
Polynomial Functions