乘法结合性质可视化活动：通过几何模型理解乘法分组

GeoGebra 命令及参数

1. Shuffle(Sequence[2, 5]) → randomNums1, {4, 5, 2, 3}
2. Element(randomNums1, Mod[questionNumber, Length[randomNums1]] + 1) → randomNum1
3. Shuffle(Sequence[2, 5] \ {randomNum1}) → randomNums2, {3, 4, 5}
4. Element(randomNums2, Mod[questionNumber, Length[randomNums2]] + 1) → randomNum2
5. Shuffle(Sequence[2, 5] \ {randomNum1, randomNum2}) → randomNums3, {3, 4}
6. Element(randomNums3, Mod[questionNumber, Length[randomNums3]] + 1) → randomNum3
7. Polygon({(0, 0), (1, 0), (1, 1), (0, 1)}) → q1
8. Sequence(Translate[q1, (0, ((1 + sepY) * kk))], kk, 0, randomNum1 - 1) → l1
9. Sequence(Translate[l1, ((1 + sepX, 0) * kk)], kk, 0, randomNum3 - 1) → l2
10. Segment(A, B) → f
11. Segment(C, D) → g
12. Zip(Cube[AA, true], AA, Flatten[l2]) → l3
13. Sequence(Translate[l3, Vector[(0, 0, kk)]], kk, 0, randomNum2 - 1) → m1