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chen mingchuan
GeoGebra
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第八周作业2
盈利與虧蝕
科赫雪花
常见四边形是否是双心四边形
双心四边形
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約分BB
Copie de 分數與小數
两角差的正切公式的证明
勾股定理证明2
解三角形（１）
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Prism
Polygons
Pyramid
Quadratic Equations
Unit Circle