用数轴减分数

GeoGebra 命令及参数

1. Point(a) → A
2. Point(a) → B
3. Segment(B, (x(B) + b, y(B))) → c
4. Segment(A, (x(A) + b, y(A))) → d
5. Sequence((x(B) + b / denom1 * i, y(B)), i, 1, denom1) → frac1dots
6. Sequence((x(A) + b / denom2 * i, y(A)), i, 1, denom2) → frac2dots
7. LCM(denom1, denom2) → commondenom
8. Sequence((x(B) + b / commondenom * i, y(B)), i, 1, commondenom) → frac1commondots
9. Sequence((x(A) + b / commondenom * i, y(A)), i, 1, commondenom) → frac2commondots
10. Vector(B, (x(B) + num1 * b / denom1, y(B))) → frac1arrow
11. Vector(A, (x(A) + num2 * b / denom2, y(A))) → frac2arrow
12. GCD(rawdifference, commondenom) → reduceby
13. Polygon(H, (x(H), y(H) - height), (x(H) + width, y(H) - height), (x(H) + width, y(H))) → poly1, h_1, j, k, l
14. Polygon(I, (x(I), y(I) - height), (x(I) + width, y(I) - height), (x(I) + width, y(I))) → poly2, i_1, m, n, p
15. Polygon(J, (x(J), y(J) - height), (x(J) + bigwidth, y(J) - height), (x(J) + bigwidth, y(J))) → poly3, j_1, q, r, s