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chenxiankai

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chenxiankai: ½ð±Ò+20, ¡ï¡ï¡ï¡ï¡ï×î¼Ñ´ð°¸ 2013-12-25 07:39:35
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7Â¥: Originally posted by chenxiankai at 2013-12-24 14:21:20
ÎÒÏë»­Õâ¸ö±¾Õ÷º¯Êý¹ØÓÚQ2£¬Q3µÄÈýάͼÐΣ¬ÎÒ¸ÃÔõÃ´ÅªÄØ£¬Âé·³ÁË£¬ÎÒÖ»ÊÇÏëÏÈÓÃÓã¬ÎÒÒ»Ö±ÓõÄÊÇFORTRAN,½Ó´¥Õâ¸ö²Å2Ìì...

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f = Root[-0.25 + 0.375 Q2^2 - 1.08866 Q2^3 + 1. Q2^4 - 0.125 Q2^6 +
     0.375 Q3^2 + 3.26599 Q2 Q3^2 + 2. Q2^2 Q3^2 - 0.375 Q2^4 Q3^2 +
     1. Q3^4 - 0.375 Q2^2 Q3^4 -
     0.125 Q3^6 + (-0.75 - 2. Q2^2 + 0.75 Q2^4 - 2. Q3^2 +
        1.5 Q2^2 Q3^2 + 0.75 Q3^4) #1 + (-1.5 Q2^2 - 1.5 Q3^2) #1^2 +
     1. #1^3 &, 1];
Plot3D[f, {Q2, 0, 1}, {Q3, 0, 1}]
8Â¥2013-12-25 05:00:20
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chenxiankai

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9Â¥2013-12-25 07:39:27
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walk1997

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{Root[f(x),1]}
±íʾµÄÊÇf(x)==0µÄµÚ1¸ö½â (½øÒ»²½ »¹ÊÇÔĶÁÏ´¿º¯ÊýµÄд·¨Óï·¨Ô¼¶¨)
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ToRadicals[%]
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-0.333333 (-1.5 Q2^2 -
    1.5 Q3^2) + ((0.209987 - 0.363708 I) (-2.25 - 6. Q2^2 -
      6. Q3^2))/(6.75 + 29.3938 Q2^3 -
    88.1817 Q2 Q3^2 + \[Sqrt](4 (-2.25 - 6. Q2^2 -
          6. Q3^2)^3 + (6.75 + 29.3938 Q2^3 - 88.1817 Q2 Q3^2)^2))^(
  1/3) - (0.132283 + 0.229122 I) (6.75 + 29.3938 Q2^3 -
    88.1817 Q2 Q3^2 + \[Sqrt](4 (-2.25 - 6. Q2^2 -
          6. Q3^2)^3 + (6.75 + 29.3938 Q2^3 - 88.1817 Q2 Q3^2)^2))^(
  1/3)

» ±¾ÌûÒÑ»ñµÃµÄºì»¨£¨×îÐÂ10¶ä£©

10Â¥2013-12-25 08:11:55
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