梯形法则

GeoGebra 命令及参数

1. If(a1 ≥ 0, 0.8, 1.1) → View1x
2. If(a1 ≟ 0, -0.2, a1) → cond2x
3. If(a ≤ 0, 0.8, 1.1) → View2y
4. If(a ≟ 0, 0.2, a) → cond2y
5. Sequence(g(i), i, a1, a, 0.1) → list1
6. Max(list1) → maxlist1
7. Min(list1) → minlist1
8. Textfield(f) → InputBox1
9. Vector(A, B) → u
10. Vector(A, C) → v
11. OrthogonalLine(C, yAxis) → h
12. OrthogonalLine(B, yAxis) → i
13. If(y(v) > 0, 0, 1) → condy
14. If(y(u) < 0, 0, 1) → condx
15. If(ymin ≟ 0, (ymax * (-0.1)), ymin) → condy2
16. If(ymax ≟ 0, (ymin * (-0.1)), ymax) → condx2
17. Textfield(a) → InputBox2
18. Sequence(a1 + ((k - 1 + d) * dx), k, 1, n) → list2
19. Sequence((f(Element[list2, i]) * dx), i, 1, n) → list4
20. Sum(list4) → RiemannSum
21. If(d ≟ 1, "R", If[d ≟ 0.5, "M", "L"]) → text3
22. Textfield(n) → InputBox3
23. Textfield(a1) → InputBox4
24. Sequence(Polygon[(a1 + ((k - 1) * dx), 0), (a1 + (k * dx), 0), (a1 + (k * dx), f(Element[list2, k])), (a1 + ((k - 1) * dx), f(Element[list2, k]))], k, 1, n) → list3
25. TrapezoidalSum(f, a1, a, n) → j