解二次方程的图形方法（III）

GeoGebra 命令及参数

1. Simplify(f(x) - g(x)) → h
2. Textfield(txtf) → inpf
3. Textfield(txtg) → inpg
4. Textfield(txth) → inph
5. Intersect(h, xAxis) → G, H
6. Polygon(Corner[1], (((x(Corner[1]) + x(Corner[2])) * 1 / 2.5), y(Corner[1])), (((x(Corner[3]) + x(Corner[4])) * 1 / 2.5), y(Corner[4])), Corner[4]) → q1, k, l, m, n
7. Root(h) → I, J
8. Coefficients(h) → hcoeff
9. Element(hcoeff, 1) → a_h
10. Element(hcoeff, 2) → b_h
11. Element(hcoeff, 3) → c_h
12. Intersect(g, f) → E, F