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Author:
孟宝兴
GeoGebra
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四邉形 (四年級) 教師版
畫出對稱圖形
直角坐標平面上的旋轉變換
兩位數除以一位數（一）
判斷球體
Discover Resources
圓圓求切圓
三角形的外心
peacock
圆的面积 - 排列组合法
體積
Discover Topics
Dilation
Limits
Probability
Distributions
Natural Numbers