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Re:我的c 程序:简单

Posted by zab08 at 2007-04-29 19:04:57 on Problem 1183
In Reply To:Re:我的c 程序:简单 Posted by:caizhicong0503 at 2007-02-11 15:30:54
 1) 1/a = (1/b + 1/c)/(1 - 1/bc)
->  1/a = (b + c)/(bc - 1)
->  (b - a)c = ab + 1
->  c = (ab + 1)/(b -a)
->  b > a (!!!!)

 2)  b + c = b + (ab + 1)/(b -a)
->   b + c = b + a + (a * a + 1)/(b -a)

  令  :t = b - a
  则有:f(t) = t + 2a +(a * a + 1)/t
  此时用数学的方法把这到题简化到了t关于a的函数
  求一下这个函数的定义域,b + c又是什么?
  当然是这个函数的值域!!

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