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矩形折叠（翻折问题）
Author:
浅蓝色
GeoGebra
New Resources
活动三：应用性质
科氏力 (Coriolis Force)
平行線的判定
盈利與虧蝕
三角函数 的副本
Discover Resources
分數加法和減法
過圓內C點的弦中點軌跡
圓柱切割
Angle between line & plane
圓周公式應用題1的副本
Discover Topics
Rational Numbers
Similar Triangles
Variance
Median Line
Expected Value