Question

求20道一元三次方程试题和答案！

Answer 1

1. x^3-24 x^2+167 x-312=0 => x={13, 8, 3}

2. x^3-23 x^2+122 x-160=0 => x={16, 5, 2}

3. x^3-32 x^2+324 x-1008=0 => x={14, 12, 6}

4. x^3-46 x^2+640 x-2400=0 => x={20, 6, 20}

5. x^3-28 x^2+251 x-728=0 => x={7, 8, 13}

6. x^3-26 x^2+139 x-114=0 => x={6, 19, 1}

7. x^3-42 x^2+581 x-2640=0 => x={16, 11, 15}

8. x^3-40 x^2+511 x-2040=0 => x={15, 8, 17}

9. x^3-25 x^2+202 x-528=0 => x={6, 11, 8}

10. x^3-32 x^2+287 x-760=0 => x={19, 5, 8}

11. x^3-26 x^2+171 x-306=0 => x={17, 3, 6}

12. x^3-31 x^2+270 x-648=0 => x={9, 18, 4}

13. x^3-31 x^2+284 x-704=0 => x={4, 11, 16}

14. x^3-37 x^2+440 x-1700=0 => x={17, 10, 10}

15. x^3-21 x^2+86 x-96=0 => x={16, 3, 2}

16. x^3-26 x^2+193 x-420=0 => x={4, 7, 15}

17. x^3-20 x^2+101 x-130=0 => x={5, 2, 13}

18. x^3-19 x^2+104 x-176=0 => x={4, 4, 11}

19. x^3-17 x^2+90 x-144=0 => x={3, 6, 8}

20. x^3-17 x^2+86 x-112=0 => x={2, 8, 7}

Answer 2

x^3+9x^2=100 x=-5