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卡尔丹公式……这个题不用这么烦，直接估算就可以很准确了

Posted by frkstyc at 2005-06-06 14:12:05 on Problem 2100
In Reply To:三次方程有求根公式么？ Posted by:palmtenor at 2005-06-06 14:07:24

Followed by:

二分么..~ (0) palmtenor 2005-06-06 14:13:07
- 直接pow(***,1.0/3) (0) frkstyc 2005-06-06 14:14:00
  - 这样...... (0) palmtenor 2005-06-06 14:16:38
  - 拿几何画板画个函数图像试试~ (0) palmtenor 2005-06-06 14:17:03
    - ft，用一点数学！1^2+...+n^2=n(n+1)(2n+1)/6=2n(2n+1)(2n+2)/24，直接开立方就可以估算2n了 (0) frkstyc 2005-06-06 14:19:05
      - 有道理....数学啊....我怎么说呢..... (0) palmtenor 2005-06-06 14:22:22

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