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第一次看见这个题目是在上海的地铁票上当时...

tutu(lazy tutu)

和先生两人讨论了一会儿,决定该题无解,xixi...:)
但今天看到说居然有解,既然如此,想了好一会儿,在纸上划了半天,
答案应该没错吧,各位多多指教.

(#48306@0)
Last Updated: 2001-4-18
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