二次表达式性质演示

GeoGebra 命令及参数

1. SelectedIndex(formtype) → formtypeindex
2. If(formtypeindex ≟ 1, (a * x^(2)) + (b * x) + c, (a * (x - h)^(2)) + k) → p_{expr}
3. If(formtypeindex ≟ 1, p_s, p_v) → p
4. Intersect(p, yAxis, 1) → yintercept
5. Vertex(p) → vertex, , ,
6. Intersect(p, xAxis) → root_1, root_2
7. Line(vertex, yAxis) → axis
8. ComplexRoot((a * x^(2)) + (b * x) + c) → z_1, z_2
9. Factor(p_{expr}) → fac
10. Coefficients(p_{expr}) → coeff