Venn图演示：用图形理解集合关系

GeoGebra 命令及参数

1. Shuffle(Sequence[3, 8]) → randomList1, {6, 7, 3, 4, 8, 5}
2. Shuffle(Sequence[15]) → randomList2, {4, 10, 9, 5, 2, 8, 7, 12, 11, 3, 15, 14, 6, 1, 13}
3. Element(randomList1Clean, Mod[countQuestion, Length[randomList1Clean]] + 1) → randomNum1
4. Element(randomList2, Mod[countQuestion, 15] + 1) → randomNum2
5. Polygon(Zip[PixelsToPoint[Corner[1], Corner[3], Corner[5], A], A, {(pixelsLeft, pixelsTop), (pixelsLeft, y(Corner[5]) - pixelsBottom), Corner[5] - (pixelsRight, pixelsBottom), (x(Corner[5]) - pixelsRight, pixelsTop)}]) → borderBox
6. Corner(5) → layoutAppSize
7. Polygon({(0, 0), (9, 0), (9, 6), (0, 6)}) → U
8. Circle(Cent1_{1}, Point1_{1}) → circ1_{1}
9. Circle(Cent2_{1}, Point2_{1}) → circ2_{1}
10. Text("U", (0, 6.4), true, true, 1, 0) → LabelUniversal
11. Text("A", (1, 4.5), true, true, 1, 1) → LabelA
12. Text("B", (7.5, 4.5), true, true, 1, 1) → labelB
13. Corner(5) → AppSize
14. Translate(hGuideLine, Vector[(Vector[Corner[4], Corner[1]] / 500 * 16)]) → hGuideLine'
15. Translate(U, (10, 0)) → USol
16. Translate(U', (10, 0)) → U''
17. Translate(BminA_{1}, (10, 0)) → BminASol
18. Translate(Int_{1}, (10, 0)) → IntSol
19. Translate(AminB_{1}, (10, 0)) → AminBSol
20. Translate(circ1_{1}, (10, 0)) → c
21. Translate(circ2_{1}, (10, 0)) → d
22. Text(text2, Midpoint[Cor1, Cor3], true, true, 0, 1) → text3
23. LaTeX(togo, true, true) → text4
24. LaTeX(counting, true, true) → text5