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军云
GeoGebra
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三角函数 的副本
双心四边形
比較五件物件的重量
撒针估算面积实验
龙形曲线-分形龙
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整數或分數÷分數_ 工作紙（一）_題1c
sierpinski carpet
圓內兩半圓相切問題
GGB3
tan90
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Circle
Trigonometry
Right Triangles
Quadratic Functions
Division