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fchengang
Author:
符成岗
GeoGebra
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科赫雪花
正方形雪花图案
第三周作业效果演示
常见四边形是否是双心四边形
盈利與虧蝕
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內切圓滾動
No.3
三角層疊
三角函數名稱的由來
根據百分率找數量（一）: 例2的副本
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Line Segment
General Quadrilateral
Sphere
Quadrilaterals
Parallelogram