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3Â¥: Originally posted by jiangwu8888 at 2011-02-03 12:26:43
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cronozhang

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jiangwu8888(½ð±Ò+2): 2011-02-16 21:48:12
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¼´f£¨x£©£½£¨x+t)^2=x^2+2 t x +t^2 ÇÒ t<0
ËùÒÔ 2 t = a ÇÒ t^2 = a^2 -3
µÃ    (a/2)^2 =a^2-3
µÃ     a = -2

(3) x^2+5/2x+1 =0 Ò׵à x=-2 or x=-1/2

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2Â¥2011-02-03 10:30:21
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jiangwu8888

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ÒýÓûØÌû:
Originally posted by cronozhang at 2011-02-03 10:30:21:
£¨1£©×¢Òâµ½f£¨x£©Ö»ÓÐÒ»¸öÁãµã£¬ËùÒÔf£¨x£©ÊÇÒ»¸öÍêȫƽ·½
¼´f£¨x£©£½£¨x+t)^2=x^2+2 t x +t^2 ÇÒ t<0
ËùÒÔ 2 t = a ÇÒ t^2 = a^2 -3
µÃ    (a/2)^2 =a^2-3
µÃ     a = -2

(3) x^2+5/2x+1 =0 Ò׵à x ...

µÚÒ»ÎʵĴð°¸ÊǸùºÅ3°¡
3Â¥2011-02-03 12:26:43
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jiangwu8888(½ð±Ò+1): 2011-02-16 21:48:18
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4Â¥2011-02-03 20:18:50
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