回复：美国奥赛题：一元二次方程（2.5星）

after 1 hr work, the answer is:

(sqrt 355)/2

seems right.

所有跟帖： 

• faint, it is 51 in original equation, not 5! -Kaolin007- ♂ (0 bytes) () 04/12/2009 postreply 00:08:28