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三角形转化平行四边形
Author:
吕玉雷
GeoGebra
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漂亮的摇摆曲线
【案例】2013年安徽高考15题
平行線的斜率
圓周公式的應用
圓的切線方程
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vector1
菱形有甚麼特性？
梯形堆垛
小船平移2
勾股定理的毕氏证明
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Derivative
Quadratic Equations
Equations
Planes
Geometric Distribution