分数数列的第n项

GeoGebra 命令及参数

1. RandomElement(l1) → a
2. RandomElement(l2) → b
3. RandomElement(l1) → c
4. RandomElement(l2) → d
5. Sequence(((a * n) + b) / ((d * n) + c), n, 1, 7) → l3
6. FractionText(u_1) → text1
7. FractionText(u_2) → text2
8. FractionText(u_3) → text3
9. FractionText(u_4) → text4
10. FractionText(u_5) → text5
11. Segment(A, B) → f
12. Textfield(e) → InputBox1
13. Textfield(g) → InputBox2
14. Textfield(i) → InputBox3
15. Textfield(h) → InputBox4
16. If(a ≟ e ∧ b ≟ g ∧ d ≟ i ∧ c ≟ h, "Correct! ", "No. Try again.") → text9