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Author:
马云辉
GeoGebra
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斜率的值
第八周作业
漂亮的摇摆曲线
【案例】2013年安徽高考15题
平行線的斜率
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pictures
parallelogram and squares
九點共圓
过圆上一点作切线,三步
旋轉的概念
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Integral Calculus
Sine
Equilateral Triangles
Constructions
Special Points