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平行四邊形有甚麼特性？
Author:
Anthony OR 柯志明
Topic:
Parallelogram
English version:
http://ggbtu.be/m79826
GeoGebra
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【案例】2013年安徽高考15题
錐體建築師
画直线等分三角形的面积
找出對稱軸
【案例】圆柱体内放置一个大球六个小球
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Reflectional Symmetry 反射對稱
三度空間中的長方體
Testing
百變火柴
数学几何
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Binomial Distribution
Ratios
Cylinder
Median Value
Upper and Lower Sum or Riemann Sum