用乘法框架动态展开二项式

GeoGebra 命令及参数

1. Textfield(a) → InputBoxa
2. Textfield(b) → InputBoxb
3. Textfield(c) → InputBoxc
4. Textfield(d) → InputBoxd
5. Segment(C14, D14) → seg1
6. Segment(C15, D15) → seg2
7. Segment(C16, D16) → seg3
8. Segment(C17, D17) → seg4
9. Text(h, C21) → textab
10. Text(q, D21) → textbc
11. Text(p, C22) → textad
12. Text(r, D22) → textbd
13. Text(a, C20) → texta
14. Text(b, D20) → textb
15. Text(c, B21) → textc
16. Text(d, B22) → textd
17. Text(multiply, B20) → text6
18. Polygon(I, J, K, L) → poly1, i_1, j_1, k_1, l_1
19. Polygon(M, N, O, P) → poly2, m_1, n, o, p_1
20. Polygon(Q, R, S, T) → poly3, q_1, r_1, s_1, t_1
21. Polygon(A_1, B_1, C_1, D_1) → poly5, a_1, b_1, c_1, d_1
22. Polygon(E_1, F_1, G_1, H_1) → poly6, e_1, f_1, g_1, h_1
23. Polygon(I_1, J_1, K_1, L_1) → poly7, i_2, j_2, k_2, l_2
24. Polygon(M_1, N_1, O_1, P_1) → poly8, m_2, n_1, o_1, p_2
25. Polygon(Q_1, R_1, S_1, T_1) → poly3_1, q_2, r_2, s_2, t_2
26. Polygon(U_1, V_1, W_1, Z_1) → poly4, u_1, v_1, w_1, z_1
27. Polygon(A_2, B_2, C_2, D_2) → poly9, a_2, b_2, c_2, d_2