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·½³Ì1.248X^2-10.231675X+20.405=0    ¸ùX1´óÓÚX2´óÓÚ0  Ôõô¾ÍÊǽⲻ³öÀ´ÄØ Ï൱ÓôÃÆÁË£¡
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ÒýÓûØÌû:
9Â¥: Originally posted by peterflyer at 2014-11-25 13:41:23
1.248X^2-10.231675X+20.405=0   
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x={10.231675¡Àsqrt[10.231675^2-4*1.248*20.405}/(2*1.248)
  =4.099227¡À1.131935
¸ùX1´óÓÚX2´óÓÚ0  
ÔòX1=4.099227+1.131935=5.231162
   X2=4 ...

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10Â¥2014-11-25 14:00:54
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wurongjun

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20130202: ½ð±Ò+10, ¡ï¡ï¡ï¡ï¡ï×î¼Ñ´ð°¸ 2014-11-25 10:57:14
feixiaolin: ½ð±Ò+20, 2014-4 ÓÅÐã°åÓÍ 2014-12-07 01:09:45
>> solve('1.248*x^2-10.231675*x+20.405','x')
ans =
[ 3.4257926370558305519455999586006]
[ 4.7726648949954514993364513234507]
ÉÆ¶ñµ½Í·ÖÕÓб¨,È˼äÕýµÀÊDz×É£.
2Â¥2014-11-25 10:43:45
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Edstrayer

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3Â¥2014-11-25 10:53:22
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20130202

Ìú³æ (СÓÐÃûÆø)

ÒýÓûØÌû:
3Â¥: Originally posted by Edstrayer at 2014-11-25 10:53:22
ÓÃÇó¸ù¹«Ê½¼ÆË㣬°´°´¼ÆËãÆ÷¾ÍµÃµ½½âÀ²£º
1.248X^2-10.231675X+20.405=0
\delta=(-10.231675)^2-4\times 1.248\times 20.405\approx 2.825413
\sqrt{\delta}\approx\sqrt{2.825413}\approx 1.680896486997
x_1\ ...

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