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rectangle
Author:
P5_MATH
GeoGebra
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平行線的判定
盈利與虧蝕
常见四边形是否是双心四边形
活动三：应用性质
科赫雪花
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onemove
求 a + b 的最大值？
中間人
電子幾何條的副本
小狗绕正五边形墙活动
Discover Topics
Differential Calculus
Incircle or Inscribed Circle
Addition
Hyperbola
Polygons