算术计算游戏（逆向操作）

GeoGebra 命令及参数

1. Random(1, 50) → N2
2. Shuffle({"+", "-", "x", "÷"}) → SignList, {"x", "÷", "-", "+"}
3. Element(SignList, If[Mod[N2, 4] ≟ 0, 4, Mod[N2, 4]]) → S
4. If(S ≟ "+", Random[1, 99], S ≟ "-", N2 + Random[1, 99], S ≟ "x", Random[1, 20], S ≟ "÷", (N2 * Random[1, 20])) → N1
5. If(S ≟ "+", N1 + N2, S ≟ "-", N1 - N2, S ≟ "x", (N1 * N2), S ≟ "÷", N1 / N2) → OUTPUT_ANS
6. AttachCopyToView(PolyLine[(-1.5001E1,-2.2558E-1), (-1.4950E1,-2.9240E-1), (-1.4884E1,-3.9263E-1), (-1.4800E1,-4.7614E-1), (-1.4733E1,-5.5967E-1), (-1.4650E1,-6.2648E-1), (-1.4533E1,-6.9330E-1), (-1.4433E1,-7.4341E-1), (-1.4366E1,-7.6012E-1), (-1.4299E1,-7.7682E-1), (-1.3230E1,-8.4364E-1), (-1.3097E1,-8.4364E-1), (-1.3030E1,-8.4364E-1), (-1.2930E1,-8.1023E-1), (-1.2846E1,-7.7682E-1), (-1.2746E1,-7.4341E-1), (-1.2646E1,-7.2671E-1), (-1.2595E1,-7.1000E-1), (-1.2245E1,-4.9285E-1), (-1.2178E1,-4.4274E-1), (-1.2094E1,-3.7592E-1), (-1.2027E1,-3.5922E-1), (-1.1961E1,-3.0910E-1), (-1.1877E1,-2.7570E-1), (-1.1827E1,-2.4229E-1), (-1.1777E1,-2.0888E-1), (-1.1710E1,-1.4206E-1), (-1.1660E1,-1.2536E-1), (-1.1610E1,-9.1950E-2), (-1.1543E1,-7.5240E-2), (-1.1493E1,-4.1828E-2), (-1.1443E1,-2.5128E-2), (-1.1393E1,-8.4281E-3), (-1.0591E1,-8.4281E-3), (-1.0441E1,-8.4281E-3), (-1.0324E1,-8.4281E-3), (-1.0257E1,-2.5128E-2), (-1.0173E1,-4.1828E-2), (-1.0123E1,-5.8540E-2), (-1.0006E1,-5.8540E-2), (-9.7224E0,-1.2536E-1), (-9.6724E0,-1.4206E-1), (-9.6224E0,-1.5876E-1), (-9.2714E0,-3.0910E-1), (-9.1214E0,-3.7592E-1), (-9.0714E0,-4.0933E-1), (-9.0044E0,-4.4274E-1), (-8.9209E0,-5.0955E-1), (-8.8206E0,-5.9307E-1), (-8.7538E0,-6.4319E-1), (-8.6035E0,-7.6012E-1), (-8.5534E0,-8.1023E-1), (-8.5032E0,-8.4364E-1), (-8.4531E0,-8.6034E-1), (-8.1692E0,-8.4364E-1), (-7.8685E0,-8.2693E-1), (-7.7181E0,-8.2693E-1), (-7.5845E0,-7.9353E-1), (-7.4676E0,-7.9353E-1), (-7.4008E0,-7.7682E-1), (-7.2671E0,-6.7660E-1), (-7.1502E0,-5.9307E-1), (-7.0166E0,-4.7614E-1), (-6.8829E0,-3.9263E-1), (-6.6825E0,-2.5899E-1), (-6.5823E0,-2.0888E-1), (-6.5321E0,-1.5876E-1), (-6.4653E0,-1.2536E-1), (-6.3818E0,-4.1828E-2), (-6.2983E0,2.4982E-2), (-6.2148E0,7.5102E-2), (-6.1312E0,1.2521E-1), (-6.0644E0,1.5862E-1), (-5.9642E0,2.0873E-1), (-5.8807E0,2.4214E-1), (-5.7805E0,2.5884E-1), (-5.7136E0,2.9225E-1), (-5.6134E0,3.0895E-1), (-5.5132E0,3.4236E-1), (-5.4130E0,3.5907E-1), (-5.3294E0,3.9248E-1), (-5.2794E0,4.0918E-1), (-5.1624E0,4.2588E-1), (-5.0956E0,4.4259E-1), (-5.0288E0,4.4259E-1), (-4.9620E0,4.4259E-1), (-4.8117E0,4.0918E-1), (-4.4275E0,2.9225E-1), (-4.3105E0,2.5884E-1), (-4.2604E0,2.2543E-1), (-4.1769E0,1.9202E-1), (-4.1268E0,1.4191E-1), (-4.0767E0,1.0850E-1), (-3.9931E0,4.1692E-2), (-3.9096E0,-2.5128E-2), (-3.8094E0,-7.5240E-2), (-3.7426E0,-1.2536E-1), (-3.5922E0,-2.0888E-1), (-3.4753E0,-2.7570E-1), (-3.4252E0,-3.2581E-1), (-3.3751E0,-3.5922E-1), (-3.2247E0,-4.5944E-1), (-3.1245E0,-5.2626E-1), (-3.0577E0,-5.5967E-1), (-2.9908E0,-5.9307E-1), (-2.8739E0,-6.4319E-1), (-2.8071E0,-6.5989E-1), (-2.6902E0,-6.5989E-1), (-2.5398E0,-6.5989E-1), (-2.4730E0,-6.2648E-1), (-2.4229E0,-6.0978E-1), (-2.3394E0,-5.7637E-1), (-2.1556E0,-4.7614E-1), (-2.1055E0,-4.4274E-1), (-2.0554E0,-3.9263E-1), (-1.9886E0,-3.4251E-1), (-1.9218E0,-2.4229E-1), (-1.8383E0,-1.5876E-1), (�,�), true], 1, (-16.620056299068303, -4.893231892963444), (8.07566286719228, 10.191913475247512), (0, 879), (1439, 0)) → stroke1
7. Textfield(INPUT) → inputBox
8. Segment(A_0, A_3) → g
9. Point(g) → A_2
10. Segment(B_1, B_2) → h
11. Point(h) → B_3
12. Segment(C_1, C_2) → f
13. Point(f) → C_3
14. Circle(D_1, 0.5) → c
15. Point(c) → D_2
16. Segment(E_1, E_0) → i
17. Point(i) → E_2
18. Semicircle(F_0, F_1) → d
19. Point(d) → F_3
20. Segment(G_0, G_1) → j
21. Point(j) → G_3
22. Segment(H_0, H_1) → k
23. Point(k) → H_3
24. Semicircle(J_1, J_0) → e
25. Point(e) → J_3
26. Segment(K_0, K_1) → l
27. Point(l) → K_2
28. Div(time, 60) → minute
29. Mod(time, 60) → second