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Author:
许业成
GeoGebra
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判斷球體
四邉形 (四年級) 教師版
柱體建築師
兩位數除以一位數（二）
【案例】圆柱体内放置一个大球六个小球
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正三角形的旋轉
椭圆的参数方程
General Form of Quadratic Functions(2) 二次函數的圖像：一般式(2)
紙幣
Similar triangles inscribed iteration