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撒针估算面积实验
Author:
孟宝兴
GeoGebra
New Resources
畫出對稱圖形
球體建築師
三位數除以一位數（二）
找出對稱軸
異分母分數減法
Discover Resources
绝对值加减的图像
tool
边长可变的正三角形上莱洛转子的滚动
畢氏定理
橢圓的副本
Discover Topics
Translation
Centroid or Barycenter
Definite Integral
Distributions
Histogram