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三角形面積
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s1109465
GeoGebra
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正方形雪花图案
第八周作业3
盈利與虧蝕
折扣
斐波那契螺旋弧线（表格法）
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冪函數
Quiz on Solving Inequalities 解不等式：測驗
IMO2015C
regtrg
繡曲線01
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Polygons
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Exponential Functions
Symmetry
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