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重叠面积（平移问题）
Author:
张书真
GeoGebra
New Resources
龙形曲线-分形龙2
双心四边形
百分數及其應用
常见四边形是否是双心四边形
折扣
Discover Resources
線性規劃xgeogebra
圓點線
七巧板
纏繞畫未完
黃金矩形
Discover Topics
Polygons
Percentages
Complex Numbers
Symmetry
Cylinder