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截圆锥—圆锥曲线
Author:
阿梁
GeoGebra
New Resources
活动三：应用性质
百分數及其應用
比較五件物件的重量
双心四边形
盈利與虧蝕
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Rotation 旋轉變換
包含除法（整數或分數 ÷ 分數）
equations of circle 1
題三
杨辉三角形 Pascal Triangle
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Mathematics
Orthocenter
Planes
Rotation
Symmetry