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重叠面积（平移问题）
Author:
张书真
GeoGebra
New Resources
百分數及其應用
折扣
撒针估算面积实验
正方形雪花图案
双心四边形
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Summary
Addition / Subtraction of 3 Directed Numbers
HW question locus 4
素因数分解 Prime Factorization
尺规作图得到黄金三角形和黄金矩形
Discover Topics
Curve Sketching
Polygons
Incircle or Inscribed Circle
Power Functions
Diagrams