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领奖台刷油漆，求表面积
Author:
吕玉雷
GeoGebra
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龙形曲线-分形龙
正方形雪花图案
撒针估算面积实验
圓的基本性質
盈利與虧蝕
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代數
echen say
V3-2-2
纏繞畫
「相似三角形」任务5的副本
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Cone
Power Functions
Multiplication
Trigonometry
Curve Sketching