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高尔顿钉板
Author:
john arnold
GeoGebra
New Resources
平行線的判定
科赫雪花
比較五件物件的重量
常见四边形是否是双心四边形
斐波那契螺旋弧线（表格法-可动态调节）
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任務1
折射率的定義
Elementary school math
扣球路徑求直線方程式(隨機出題)
解三角形（１）
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Function Graph
Arithmetic
Sine
Arithmetic Operations
Exponential Functions