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毕达哥拉斯的勾股定理证明图
Author:
许春兰
GeoGebra
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正方形雪花图案
垂直線的斜率
圓的切線方程
双心四边形
科氏力 (Coriolis Force)
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Projection
小青蛙
學習活動二解的圖形
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Quadratic Equations
Indefinite Integral
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