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单摆演示动画
Author:
wanghailong
GeoGebra
New Resources
双心四边形
撒针估算面积实验
活动三：应用性质
盈利與虧蝕
直線的斜率：水平變化 & 鉛垂變化
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畫三角形 題1e
正四面體
共點線1
推移畢氏
翰林B4講p192-例1
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Rectangle
Rhombus
Cube
Trapezoid
Conic Sections