抛物线段面积比

GeoGebra 命令及参数

1. Root(f) → A, B
2. Integral(f, x1, x2) → areay
3. Polygon(A, (x1, avgy), (x2, avgy), B) → q1, a, g, h, b
4. Intersect(f, q1) → C, D, E, F, G, H
5. Segment(D, (x3, 0)) → i
6. Segment(E, (x4, 0)) → j
7. Integral(f(x) - avgy, x3, x4) → c
8. Segment((x3, 0), (x4, 0)) → m
9. Polygon((x3, 0), (x3, avgy), (x4, avgy), (x4, 0)) → q2, n, p, q, r
10. Segment((0, avgy), (30, avgy)) → l