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记不记得M=-b/2a (+ -) sqrt( b*b-4ac)/2a ? (水城百事)

by wolf, Tuesday, March 30, 2010, 11:17 @ aaa

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若M的平方+M+1=0,则M的平方+1/M的平方=? （M-1/M）的平方=? - aaa ; 10-03-30,10:22 (#17274) Reply (水城百事)
- 似乎是复数 - wolf ; 10-03-30,10:31 (#17276) Reply
  - 在线急等，各位大侠请赐教！ - aaa ; 10-03-30,10:35 (#17277) Reply
    - 记不记得M=-b/2a (+ -) sqrt( b*b-4ac)/2a ? - wolf ; 10-03-30,11:17 (#17289) Reply
- m^2+m+1=0 - yellowsea ; 10-03-30,11:31 (#17293) Reply
  - 如果想解方程得话 - yellowsea ; 10-03-30,11:37 (#17294) Reply
    - m^2+1/m^2 = -1, (m-1/m)^2 = -3 - GuoKe ; 10-03-30,11:41 (#17297) Reply
  - m^2+m+1 = (m^2+m+1/4)+3/4 = (m+1/2)^2+3/4， (m+1/2)^2 肯定是>=0, 所以这条题根本无解。 - aeiou ; 10-03-30,16:37 (#17319) Reply
    - 有一种数叫复数:) - yellowsea ; 10-03-30,16:49 (#17329) Reply
      - 当然这个要到高中才会学到:) - yellowsea ; 10-03-30,16:53 (#17330) Reply
        
        复数已经忘了 - aeiou ; 10-03-30,17:15 (#17341) Reply
    - 谢谢！本人也做出来了。GUOKE答得完全正确。 - aaa ; 10-03-30,16:58 (#17334) Reply
      - 你在线急等的，不会这么晚才做出来吧:) - yellowsea ; 10-03-30,17:10 (#17337) Reply

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