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数豆豆
GeoGebra
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三角函数 的副本
平行線的斜率
折扣
正方形雪花图案
撒针估算面积实验
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以剪貼比較圖形大小
正方體的反射對稱1
Scientific Notation 科學記數法
雙曲柄
p04 fixed distance from a line
Discover Topics
Geometry
Circle
Conic Sections
Sine
Trapezoid