数位练习：用多边形与随机点直观理解位值

GeoGebra 命令及参数

1. Polygon(A, B, C, D) → polyU9b_1, seg9b, seg9c, seg9d, seg9a
2. Polygon(E, F, G, H) → polyU7b, seg7b, seg7c, seg7d, seg7a
3. Polygon(I, J, K, L) → polyU5B, seg5b, seg5c, seg5d, seg5a
4. Polygon(M, N, O, P) → polyU3b, seg3b, seg3c, seg3d, seg3a
5. Polygon(Q, R, S, T) → polyU1B, seg1b, seg1c, seg1d, seg1a
6. Polygon(U, V, W, Z) → polyT9b, seg90b, seg90c, seg90d, seg90a
7. Polygon(A_1, B_1, C_1, D_1) → polyT7b, seg70b, seg70c, seg70d, seg70a
8. Polygon(E_1, F_1, G_1, H_1) → polyT5b, seg50b, seg50c, seg50d, seg50a
9. Polygon(I_1, J_1, K_1, L_1) → polyT3b, seg30b, seg30c, seg30d, seg30a
10. Polygon(M_1, N_1, O_1, P_1) → polyT1b, seg10b, seg10c, seg10d, seg10a
11. Polygon(Q_1, R_1, S_1, T_1) → polyC9b, seg900b, seg900a, seg900d, seg900c
12. Polygon(U_1, V_1, W_1, Z_1) → polyC7b, seg700b, seg700c, seg700d, seg700a
13. Polygon(A_2, B_2, C_2, D_2) → polyC5b, seg500b, seg500c, seg500d, seg500a
14. Polygon(E_2, F_2, G_2, H_2) → polyC3b, seg300b, seg300c, seg300d, seg300a
15. Polygon(I_2, J_2, K_2, L_2) → polyC1b, seg100b, seg100c, seg100d, seg100a
16. Segment(M_2, N_2) → dividerUnit
17. Segment(O_2, P_2) → dividerTens
18. Random(0, 999) → num_A
19. Segment(Q_2, R_2) → dividerUp
20. Intersect(seg9a, seg9d) → S_2
21. Intersect(seg9d, seg9c) → T_2
22. Intersect(seg7c, seg7b) → U_2
23. Intersect(seg7a, seg7b) → V_2
24. Polygon(S_2, T_2, U_2, V_2) → polyU8b, seg8b, seg8c, seg8d, seg8a
25. Intersect(seg7a, seg7d) → W_2
26. Intersect(seg7d, seg7c) → Z_2
27. Intersect(seg5c, seg5b) → A_3
28. Intersect(seg5a, seg5b) → B_3
29. Polygon(W_2, Z_2, A_3, B_3) → polyU6b, seg6b, seg6c, seg6d, seg6a
30. Point(seg5d) → C_3
31. Intersect(seg5d, seg5c) → D_3
32. Intersect(seg3c, seg3b) → E_3
33. Intersect(seg3a, seg3b) → F_3
34. Polygon(C_3, D_3, E_3, F_3) → polyU4b, seg4b, seg4c, seg4d, seg4a
35. Intersect(seg3a, seg3d) → G_3
36. Intersect(seg1c, seg1b) → I_3
37. Intersect(seg1a, seg1b) → J_3
38. Polygon(G_3, H_3, I_3, J_3) → polyU2b, seg2b, seg2c, seg2d, seg2a
39. Intersect(seg30d, seg30c) → K_3
40. Intersect(seg10c, seg10b) → L_3
41. Intersect(seg10a, seg10b) → M_3
42. Intersect(seg30a, seg30d) → N_3
43. Polygon(K_3, L_3, M_3, N_3) → polyT2b, seg20c, seg20d, seg20a, seg20b
44. Intersect(seg30c, seg30b) → O_3
45. Intersect(seg30a, seg30b) → P_3
46. Point(seg50a) → Q_3
47. Intersect(seg50d, seg50c) → R_3
48. Polygon(O_3, P_3, Q_3, R_3) → polyT4b, seg40d, seg40a, seg40b, seg40c
49. Point(seg50b) → S_3
50. Intersect(seg70a, seg70d) → T_3
51. Intersect(seg50c, seg50b) → V_3
52. Polygon(S_3, T_3, U_3, V_3) → polyT6b, seg60a, seg60b, seg60c, seg60d
53. Intersect(seg90a, seg90d) → W_3
54. Intersect(seg90d, seg90c) → Z_3
55. Intersect(seg70c, seg70b) → A_4
56. Polygon(W_3, Z_3, A_4, B_4) → polyT8b, seg80b, seg80c, seg80d, seg80a
57. Point(seg900d) → C_4
58. Intersect(seg900c, seg900d) → D_4
59. Intersect(seg700c, seg700b) → E_4
60. Intersect(seg700a, seg700b) → F_4
61. Polygon(C_4, D_4, E_4, F_4) → polyC8b, seg800b, seg800c, seg800d, seg800a
62. Point(seg700d) → G_4
63. Intersect(seg700d, seg700c) → H_4
64. Intersect(seg500c, seg500b) → I_4
65. Intersect(seg500a, seg500b) → J_4
66. Polygon(G_4, H_4, I_4, J_4) → polyC6b, seg600b, seg600c, seg600d, seg600a
67. Intersect(seg500a, seg500d) → K_4
68. Intersect(seg500d, seg500c) → L_4
69. Point(seg300c) → M_4
70. Intersect(seg300a, seg300b) → N_4
71. Polygon(K_4, L_4, M_4, N_4) → polyC4b, seg400b, seg400c, seg400d, seg400a
72. Point(seg300a) → O_4
73. Intersect(seg300d, seg300c) → P_4
74. Intersect(seg100c, seg100b) → Q_4
75. Intersect(seg100a, seg100b) → R_4
76. Polygon(O_4, P_4, Q_4, R_4) → polyC2b, seg200b, seg200c, seg200d, seg200a
77. Mod(num_A, 10) → numU
78. Mod(num_A, 100) → numTT