4623 ⁄ (1 + r) + 7314 ⁄ (1 + r)^2 + 10292 ⁄ (1 + r)^3 +
13569 ⁄ (1 + r)^4 + 17159 ⁄ (1 + r)^5 + 20853 ⁄ (1 + r)^6 +
24656 ⁄ (1 + r)^7 + 28568 ⁄ (1 + r)^8 + 32595 ⁄ (1 + r)^9 +
36738 ⁄ (1 + r)^10 + 41001 ⁄ (1 + r)^11 + 45388 ⁄ (1 + r)^12 +
49902 ⁄ (1 + r)^13 + 54546 ⁄ (1 + r)^14 + 59323 ⁄ (1 + r)^15 +
64238 ⁄ (1 + r)^16 + 69294 ⁄ (1 + r)^17 + 74494 ⁄ (1 + r)^18 +
79842 ⁄ (1 + r)^19 + 85343 ⁄ (1 + r)^20 + 90999 ⁄ (1 + r)^21 +
96816 ⁄ (1 + r)^22 + 102797 ⁄ (1 + r)^23 + 102797 ⁄ (1 + r)^24 +
115283 ⁄ (1 + r)^25 + 121800 ⁄ (1 + r)^26 + 128509 ⁄ (1 + r)^27 +
385414 ⁄ (1 + r)^28 = 2034280 求r
用excel 迭代 70多次就无法计算了。
Solve[4623 ⁄ (1 + r) + 7314 ⁄ (1 + r)^2 + 10292 ⁄ (1 + r)^3 +
13569 ⁄ (1 + r)^4 + 17159 ⁄ (1 + r)^5 + 20853 ⁄ (1 + r)^6 +
24656 ⁄ (1 + r)^7 + 28568 ⁄ (1 + r)^8 + 32595 ⁄ (1 + r)^9 +
36738 ⁄ (1 + r)^10 + 41001 ⁄ (1 + r)^11 + 45388 ⁄ (1 + r)^12 +
49902 ⁄ (1 + r)^13 + 54546 ⁄ (1 + r)^14 + 59323 ⁄ (1 + r)^15 +
64238 ⁄ (1 + r)^16 + 69294 ⁄ (1 + r)^17 + 74494 ⁄ (1 + r)^18 +
79842 ⁄ (1 + r)^19 + 85343 ⁄ (1 + r)^20 + 90999 ⁄ (1 + r)^21 +
96816 ⁄ (1 + r)^22 + 102797 ⁄ (1 + r)^23 + 102797 ⁄ (1 + r)^24 +
115283 ⁄ (1 + r)^25 + 121800 ⁄ (1 + r)^26 + 128509 ⁄ (1 + r)^27 +
385414 ⁄ (1 + r)^28 == 2034280, {r}]
Mathematica 解出口来的看不懂
{{r -> Root[
1964153 ⁄ - "MathMLPresentationTag"[2034280] + 40628225 ⁄ #1 +
444299147 ⁄ #1^2 + 3287245868 ⁄ #1^3 + 18136440499 ⁄ #1^4 +
78640895012 ⁄ #1^5 + 276922015721 ⁄ #1^6 +
809676594130 ⁄ #1^7 + 1996859604626 ⁄ #1^8 +
4201928953081 ⁄ #1^9 + 7608206451235 ⁄ #1^10 +
11926807784165 ⁄ #1^11 + 16257823490133 ⁄ #1^12 +
19325210524997 ⁄ #1^13 + 20061017802769 ⁄ #1^14 +
18190557444329 ⁄ #1^15 + 14393331320976 ⁄ #1^16 +
9915007597704 ⁄ #1^17 + 5923973270202 ⁄ #1^18 +
3053301778330 ⁄ #1^19 + 1347492762757 ⁄ #1^20 +
504092165320 ⁄ #1^21 + 157692295949 ⁄ #1^22 +
40487655695 ⁄ #1^23 + 8309810347 ⁄ #1^24 + 1311005006 ⁄ #1^25 +
149278035 ⁄ #1^26 + 10920101 ⁄ #1^27 + 385414 ⁄ #1^28 &,
1]}, {r ->
Root[1964153 ⁄ - "MathMLPresentationTag"[2034280] + 40628225 ⁄ #1 +
以上只是一部分, r 最后到底是多少啊?谢谢!


雷达卡





京公网安备 11010802022788号







