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國徽
Author:
ccwen
GeoGebra
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比較五件物件的重量
盈利與虧蝕
斜率的值
龙形曲线-分形龙
科氏力 (Coriolis Force)
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testing
十字交乘法
例題6
ie 6
三角形的面積
Discover Topics
Area
Perimeter
Parametric Curves
Median Line
Planes