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半角模型：勾股与旋转
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学用数学
GeoGebra
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平行線的斜率
垂直線的斜率
盈利與虧蝕
正方形雪花图案
撒针估算面积实验
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分數除法2: p/q ÷ b（均分）
Parallelogram 02
畢氏定理
homework3
二元线性规划的图解法(18.2 例4)
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Trigonometry
Circle
Cube
Similar Triangles
Diagrams