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圓錐曲線_1
Author:
陳澤瑩
GeoGebra
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龙形曲线-分形龙2
比較五件物件的重量
正方形雪花图案
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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play tennis
Opening Box
semops_圓錐
Test1
折扣 例6的副本
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Arithmetic
Mathematics
Subtraction
Function Graph
LCM and GCD