用维恩图演示集合的并集与交集

① This example uses a Venn diagram to visually demonstrate the union and intersection of two sets, with circular regions representing sets and highlighted overlapping or combined areas. ② The core mathematical concepts are set theory operations: union (∪) and intersection (∩), along with the relationships and region partitioning between sets. ③ Construction highlights: based on the construction summary, it uses GeoGebra commands such as Circle to create two circles (objects A and B), Intersect to find their intersection points (C and D), and CircleArc to draw arcs forming the Venn diagram boundaries; text objects (text1 to text5) label set names and operation results, with auxiliary segments (a, b) and special points (e, f, g, h) possibly aiding explanation. ④ Suitable for middle school (junior high or high school) introductory set theory, or college discrete mathematics, helping students intuitively grasp graphical representations of set operations.