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2.2 区间
Author:
GeoGebra Institute of WuXi
GeoGebra
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平行線的判定
比較五件物件的重量
折扣
撒针估算面积实验
斐波那契螺旋弧线（表格法-可动态调节）
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選擇合適的「中間人」
五角星动画
Congruent and Similarity
Copy of 正方体展开图
根據百分率找數量（一）: 例3的副本
Discover Topics
Functions
Triangles
Limits
Sphere
Exponential Functions