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chihchengliang
GeoGebra
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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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正方形雪花图案
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正二十面體
相似三角形例題
glt-c02-09 五角柱旋轉
橢圓軌跡03
解題二
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Exponential Functions
Subtraction
Constructions
Statistical Characteristics
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