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Author:
tao sun
GeoGebra
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盈利與虧蝕
正方形雪花图案
百分數及其應用
常见四边形是否是双心四边形
撒针估算面积实验
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七巧板貓咪2
判斷錐體 5
指數1209
兩圓內外公切線
切線性質B
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Constructions
Surface
Conic Sections
Calculus
Solids or 3D Shapes