从根识别二次函数 (x^2+bx+c)

GeoGebra 命令及参数

1. Random(-10, 10) → b
2. Random(1, 1) → a
3. Random(1, 1) → c
4. Random(-10, 10) → d
5. If((a * d) + (b * c) < 0, (-((a * d) + (b * c))), (a * d) + (b * c)) → B
6. If((b * d) < 0, ((b * d) * (-1)), (b * d)) → C
7. If((a * d) + (b * c) < 0, "-", "+") → sign1
8. If((b * d) < 0, "-", "+") → sign2
9. If(b < 0, "- ", "+") → sign3
10. If(d < 0, "- ", "+") → sign4
11. Textfield(ansA) → InputBox1
12. Textfield(ansB) → InputBox2
13. Textfield(ansC) → InputBox3
14. Textfield(ansD) → InputBox4
15. Root(f) → L, M
16. Extremum(f) → N
17. Random(-10, 10) → b_1
18. Random(1, 9) → a_1
19. Random(1, 9) → c_1
20. Random(-10, 10) → d_1
21. If((a * d) + (b * c) < 0, "-", "+") → sign1_1
22. If((b * d) < 0, "-", "+") → sign2_1