二次函数图像绘制 by David T

GeoGebra 命令及参数

1. If(b < 1, "-", "") → signb
2. If(a < 1, "-", "+") → signaa
3. If(b < 1, "-", "+") → signbb
4. If(a < 1, "-", "") → signa
5. Expand(F_1 / F_2 * (x + a) * (x + b)) → expand
6. If(a ≟ 0, "", "(") → LBr_a
7. If(a ≟ 0, "", ")") → RBr_a
8. If(b ≟ 0, "", "(") → LBr_b
9. If(b ≟ 0, "", ")") → RBr_b
10. Intersect(k, xAxis) → A, B
11. Intersect(k, s) → D,
12. Point(n) → C
13. Intersect(k, n) → E,
14. Intersect(k, yAxis) → F,
15. If(a ≟ 0, "", signaa) → signaaa
16. If(b ≟ 0, "", signbb) → signbbb
17. If(absa ≟ 0, "", "" + absa) → absaa
18. If(absb ≟ 0, "", "" + absb) → absbb
19. If(Fact < 0, "-", "") → signFact
20. GCD(F_1, F_2) → HCF
21. If((a > 0) ∧ (b > 0) ∧ (HCF < 2) ∧ (den ≠ 1), "", If[den ≟ 0, " undefined", If[den ≠ 1, "\large{" + signFact + "} " + "\large \frac{" + num + "}{" + den + "}", signFact + num]]) → Fract