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Mr CHANG
GeoGebra
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撒针估算面积实验
中华人民共和国国旗
双心四边形
斐波那契螺旋弧线(表格法-可动态调节)
比較五件物件的重量
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mathmathmath
積分
World's Hardest Easy Geometry Problem.
整數加減向量示意
國旗
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Polygons
Curve Sketching
Angles
Algebra
Circle