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祖冲之的期望：内棋与外棋
Author:
孟宝兴
GeoGebra
New Resources
兩位數加法
畫出對稱圖形
直角坐標平面上的旋轉變換
【案例】圆柱体内放置一个大球六个小球
錐體建築師
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選四塊來拼砌正方形
圓錐曲線---橢圓
棒形圖3
Ex5D#5
橢圓1--同心圓法
第二章 导数定义引例（蜂群增长）
Discover Topics
Vectors 3D (Three-Dimensional)
Quadratic Equations
Ellipse
Matrices
Equilateral Triangles