送交者: 陆仁甲 于 2008-02-12, 07:22:37:

回答: 数学竞赛不神秘，您的孩子也可以参加！——美国初、高中数学竞赛解密 由 DrKevin 于 2008-02-12, 01:49:53:

• 我给你一道题吧 - smileykingkong (91 bytes) 2008-02-12, 09:57:07 (204635)
  • 来个综合吧 - permutation (353 bytes) 2008-02-12, 13:27:57 (204742)
    • "不难证明2，3，5是不可能的", why? (无内容) - 008 (0 bytes) 2008-02-12, 15:26:20 (204777)
      • 因为没有一个小正方形 - permutation (908 bytes) 2008-02-12, 16:37:59 (204794)
  • All numbers greater than 3 except the following 14 numbers - Cowboy (64 bytes) 2008-02-12, 12:31:11 (204690)
    • 9? - permutation (22 bytes) 2008-02-12, 12:46:49 (204700)
      • You are right. Should be all number greater than 3 except 5 and 6 (无内容) - Cowboy (0 bytes) 2008-02-12, 12:59:27 (204710)
        • 11 and 14 as well (无内容) - permutation (0 bytes) 2008-02-12, 13:01:26 (204713)
          • when you have 8, you will have 11, 14, etc. (无内容) - Cowboy (0 bytes) 2008-02-12, 13:06:32 (204718)
        • 6? (无内容) - 008 (0 bytes) 2008-02-12, 13:00:15 (204712)
  • 1 + sum(n_i^2 - 1) - permutation (91 bytes) 2008-02-12, 12:06:27 (204673)
    • 1 + 3 * x + 8 * y - permutation (118 bytes) 2008-02-12, 12:54:10 (204704)
      • 6 can be done easily (无内容) - 008 (0 bytes) 2008-02-12, 12:59:32 (204711)
      • 你几乎在那里了. (无内容) - smileykingkong (0 bytes) 2008-02-12, 12:58:01 (204708)
    • 太繁琐了. 而且也不完全对. (无内容) - smileykingkong (0 bytes) 2008-02-12, 12:48:48 (204701)
      • any number except 2 3 5 6 11 14 (无内容) - permutation (0 bytes) 2008-02-12, 12:56:01 (204706)
        • if 1 is the one, should be all numbers except 2,3,5,6 (无内容) - Cowboy (0 bytes) 2008-02-12, 13:03:14 (204715)
          • don't think you can do 11 or 14 (无内容) - permutation (0 bytes) 2008-02-12, 13:07:20 (204719)
          • all except 2,3,5 (无内容) - smileykingkong (0 bytes) 2008-02-12, 13:05:48 (204717)
            • you guys are right - permutation (67 bytes) 2008-02-12, 13:12:59 (204728)
    • n_i > 1 (无内容) - permutation (0 bytes) 2008-02-12, 12:11:07 (204676)
  • 4+3(n-1)=3n+1, (n=1,2,3,.....n) (无内容) - yongshi (0 bytes) 2008-02-12, 10:44:29 (204645)
    • 不对 (无内容) - smileykingkong (0 bytes) 2008-02-12, 10:45:08 (204646)

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