习题1.4 P23页 第3题（3）【1 复习参考题1 P35 第9题（AUB=A）】

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• Offline Activity (.zip)

• GeoGebra Files

  1. 集合A、B满足什么条件时，会有A交B=A？A并B=A？ (.ggb)
     
  2. P10 图1.3-1 并集动态展示 (.ggb)
     
  3. P11 图1.3-3 集合交集动态展示 (.ggb)