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圆与椭圆
Author:
李大地(Field Lee)
GeoGebra
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直線的斜率
斜率的值
第八周作业3
平行線的斜率
折扣
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欢度春节（灯笼）
gjh-e01-02 未知數邊長的長方形
三視圖01
比例中的定值問題(二)
gjh-g03-00 和的平方公式的副本
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Angles
Differential Calculus
General Quadrilateral
Rhombus
Translation