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精度....

Posted by liuyuquan100 at 2008-06-23 20:03:55 on Problem 1905 
鉴于牛人的提示，用牛顿迭代＋下山算法（不知有没有起作用）终于过了。精度用到e-12，不过要注意当l'为0的时候，即三个输入中有一个是0的情况。。。
精度。。
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