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Re:我的c 程序：简单

Posted by terry145 at 2008-03-14 18:17:42 on Problem 1183
In Reply To:我的c 程序：简单 Posted by:gardner at 2005-10-09 07:44:25 
 1    (1/b)+(1/c)
--- =-------------
 a      1-(1/bc)
    
      b+c 
    =------
      bc-1

易知b>a, c>a 不妨设b=a+x,c=a+y

(1\a)=(2a+x+y)/(a^2+xa+ya+xy-1)

a^2+(x+y)a+xy-1=2a^2+(x+y)a

xy=a^2+1

易知a与b的差越大a+b越小
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