比例关系写作与绘图：线性函数与比例图形的可视化

GeoGebra 命令及参数

1. Union(Sequence[-20, -1], Sequence[1, 20]) → numlist
2. Sequence(1, 10) → denomlist
3. Sequence(-20, 20) → blist
4. Sequence(11, 50) → n
5. FractionText(s) → text1
6. Denominator(s) → a
7. Textfield(g) → InputBox1
8. Sequence(i, i, 1, 20, 1) → kseq
9. RandomElement(kseq) → k
10. Sequence((a * i), i, 5, 75, 1) → deonm2list
11. RandomElement(deonm2list) → chosenans
12. PointIn(x ≥ 0) → A
13. PointIn(x ≥ 0) → B
14. Slope(eq1) → c
15. Intersect(eq1, x = 0) → C
16. Line(A, B) → f_1