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project euler202（反射光线路线数）
Author:
朱亮
GeoGebra
New Resources
兩位數加法
異分母分數減法
拼砌四邊形
判斷球體
直角坐標平面上的旋轉變換
Discover Resources
平移旋轉對稱
Positive angles & Negative angles
人教版必修1函数的表示方法P20例4
繡曲線01
螺旋线
Discover Topics
Addition
Expected Value
Inequalities
Tangent Line or Tangent
Combinatorics