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fcg周期变换
Author:
符成岗
GeoGebra
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异形操场
比較五件物件的重量
科赫雪花
正方形雪花图案
斐波那契螺旋弧线（表格法-可动态调节）
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長方形和正方形的面積_題A至E
Apollonius Problem gergonne 2
ex 2
異分母分數加法
求切线方程(改进)
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Vectors
Division
Parallelogram
Integers
Quadrilaterals