用模型解方程:可视化平衡与代数步骤

用模型解方程:可视化平衡与代数步骤
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2016-05-15 06:56
① 这个范例通过一个交互式几何模型,直观演示了如何构建并求解一元方程,将抽象的代数运算转化为可视化的图形操作。② 核心数学概念包括方程、等式性质、移项与合并同类项,以及根(解)的几何意义;同时涉及减法、指数函数和四边形等基础图形元素。③ 作图要点:使用GeoGebra命令如Point、Circle、Polygon、Ray、Intersect等创建图形,并利用CreatePositiveBag、CreatePositiveMarble、CreateNegativeBag、CreateNegativeMarble、CountIf、Random等命令模拟正负“袋子”和“弹珠”的计数与随机生成,从而构建方程两边的平衡模型;对象包括n、B系列、N系列、listNegBags、A、j等,通过交互操作改变数量来求解。④ 适合初中至高中阶段学生学习代数方程,也可用于教师课堂演示,帮助学生理解方程求解的每一步骤,培养从具体模型到抽象符号的过渡能力。

GeoGebra 命令及参数

  1. Point(n) → B
  2. Point(j) → A
  3. Circle(M_6, a) → c
  4. Circle(A_6, b) → d
  5. Point(d) → C_1
  6. Polygon(A_6, C_1, 4) → poly1, e, f, g, h, D_1, E_1
  7. CreatePositiveBag(b, A_1) → poly2
  8. CreatePositiveBag(b, A_5) → poly3
  9. CreatePositiveBag(b, A_3) → poly4
  10. CreatePositiveBag(b, A_4) → poly5
  11. CreatePositiveBag(b, A_2) → poly6
  12. CreatePositiveBag(b, A_7) → poly7
  13. CreatePositiveBag(b, A_8) → poly8
  14. CreatePositiveBag(b, A_9) → poly9
  15. CreatePositiveBag(b, A_10) → poly10
  16. CreatePositiveMarble(a, M_1) → k
  17. CreatePositiveMarble(a, M_4) → p
  18. CreatePositiveMarble(a, M_5) → q
  19. CreatePositiveMarble(a, M_10) → r
  20. CreatePositiveMarble(a, M_9) → s
  21. CreatePositiveMarble(a, M_3) → t
  22. CreatePositiveMarble(a, M_2) → c_1
  23. CreatePositiveMarble(a, M_8) → d_1
  24. CreatePositiveMarble(a, M_7) → e_1
  25. CountIf((x > x(A)) ∧ (x < x(B)), listPosBags) → PositiveBags
  26. CountIf((x > x(A)) ∧ (x < x(B)), listPosMarbles) → PositiveMarbles
  27. Circle(N_4, a) → f_1
  28. CreateNegativeMarble(a, N_1) → g_1
  29. CreateNegativeMarble(a, N_2) → h_1
  30. CreateNegativeMarble(a, N_3) → k_1
  31. CreateNegativeMarble(a, N_5) → p_1
  32. CreateNegativeMarble(a, N_6) → q_1
  33. CreateNegativeMarble(a, N_7) → r_1
  34. CreateNegativeMarble(a, N_8) → s_1
  35. CreateNegativeMarble(a, N_9) → t_1
  36. CreateNegativeMarble(a, N_10) → c_2
  37. CreatePositiveBag(b, B_3) → poly11
  38. CreateNegativeBag(b, B_7) → poly12
  39. CreateNegativeBag(b, B_6) → poly13
  40. CreateNegativeBag(b, B_10) → poly14
  41. CreateNegativeBag(b, B_9) → poly15
  42. CreateNegativeBag(b, B_8) → poly16
  43. CreateNegativeBag(b, B_5) → poly17
  44. CreateNegativeBag(b, B_4) → poly18
  45. CreateNegativeBag(b, B_2) → poly19
  46. CreateNegativeBag(b, B_1) → poly20
  47. CountIf((x > x(A)) ∧ (x < x(B)), listNegMarbles) → NegativeMarbles
  48. CountIf((x > x(A)) ∧ (x < x(B)), listNegBags) → NegativeBags
  49. CountIf(x > x(B), listNegMarbles) → NegativeMarblesRight
  50. CountIf(x > x(B), listPosBags) → PositiveBagsRight
  51. Random(-4, 5) → ValueofX
  52. CountIf(x > x(B), listNegBags) → NegativeBagsRight
  53. CountIf(x > x(B), listPosMarbles) → PositiveMarblesRight
  54. CreatePositiveBag(b, A_11) → poly21
  55. CreatePositiveBag(b, A_18) → poly22
  56. CreatePositiveBag(b, A_12) → poly23
  57. CreatePositiveBag(b, A_17) → poly24
  58. CreatePositiveBag(b, A_15) → poly25
  59. CreatePositiveBag(b, A_20) → poly26
  60. CreatePositiveBag(b, A_16) → poly27
  61. CreatePositiveBag(b, A_14) → poly28
  62. CreatePositiveBag(b, A_13) → poly29
  63. CreatePositiveBag(b, A_19) → poly30
  64. CreatePositiveMarble(a, M_11) → d_2
  65. CreatePositiveMarble(a, M_14) → e_2
  66. CreatePositiveMarble(a, M_12) → f_2
  67. CreatePositiveMarble(a, M_15) → g_2
  68. CreatePositiveMarble(a, M_13) → h_2
  69. CreatePositiveMarble(a, M_16) → k_2
  70. CreatePositiveMarble(a, M_17) → p_2
  71. CreatePositiveMarble(a, M_18) → q_2
  72. CreatePositiveMarble(a, M_19) → r_2
  73. CreatePositiveMarble(a, M_20) → s_2
  74. CreateNegativeBag(b, B_11) → poly31
  75. CreateNegativeBag(b, B_12) → poly32
  76. CreateNegativeBag(b, B_13) → poly33
  77. CreateNegativeBag(b, B_14) → poly34
  78. CreateNegativeBag(b, B_15) → poly35
  79. CreateNegativeBag(b, B_16) → poly36
  80. CreateNegativeBag(b, B_17) → poly37
  81. CreateNegativeBag(b, B_18) → poly38
  82. CreateNegativeBag(b, B_19) → poly39
  83. CreateNegativeBag(b, B_20) → poly40
  84. CreateNegativeMarble(a, N_11) → t_2
  85. CreateNegativeMarble(a, N_12) → c_3
  86. CreateNegativeMarble(a, N_13) → d_3
  87. CreateNegativeMarble(a, N_14) → e_3
  88. CreateNegativeMarble(a, N_15) → f_3
  89. CreateNegativeMarble(a, N_16) → g_3
  90. CreateNegativeMarble(a, N_17) → h_3
  91. CreateNegativeMarble(a, N_18) → k_3
  92. CreateNegativeMarble(a, N_19) → p_3
  93. CreateNegativeMarble(a, N_20) → q_3
  94. Random(-4, 4) → SeedBagLeft
  95. Random(-4, 4) → SeedBagRight
  96. Random(-5, 5) → SeedMarbleLeft
  97. Intersect(j, a_1) → C
  98. Intersect(n, a_1) → D
  99. Ray(C, D) → b_1

AI 绘图提示语参考

画一个天平模型来表示线性方程的解。首先,创建两个点A和n作为方程的两边。然后,围绕A和n分别画两个圆c和d,并在d上创建点C。接着,使用A和C创建一个四边形,并在四边形内部创建一些正方形和圆形来表示正数和负数的‘袋子’和‘弹珠’。最后,通过计数和随机生成来模拟正数和负数的分布,展示方程的解。
以上提示语为根据原始绘图命令整理而来,仅供参考。