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大十字
Author:
陳柄何
GeoGebra
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【案例】2018年全国1卷理科12题
三位數除以一位數（二）
空间中两直线的位置关系
漂亮的摇摆曲线
圓的切線方程
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省政信箱
大邊對大角
Different Forms of Quadratic Functions 二次函數的不同形式
Time
圆形磁场
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General Quadrilateral
Similarity Transformation or Similarity
Exponential Functions
Orthocenter
Sine