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勾股定理的毕氏证明（吴兴海)
Author:
吴兴海
GeoGebra
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撒针估算面积实验
比較五件物件的重量
常见四边形是否是双心四边形
第八周作业1
正方形雪花图案
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畢氏定理證明
優良作品2(薇如)
Golden Ratio (phi) Collection
圆在直线上滚动
小五_近似值
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Ellipse
Power Functions
Parallelogram
Inequalities
Equations