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fchengang动画1
Author:
符成岗
GeoGebra
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平行線的斜率
圓周公式的應用
探究三角形的全等條件
【案例】2013年安徽高考15题
祖冲之的期望：内棋与外棋
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直角三角形直角三角形
高中, 直線與點對稱
外公切線長
Gazing Cow Problem (b)
[拋物線]與直線相切且與圓外切之所有圓的圓心軌跡方程式
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Volume
Addition
Cosine
Vectors 2D (Two-Dimensional)
Difference and Slope