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不是这种情况哈，见内

Posted by richardxx at 2008-02-25 13:50:01
In Reply To:多谢指点，不过请问你说的是这种情况么（见内） Posted by:xiaox at 2008-02-25 13:33:27 
A      D
|\    /\
| \  /  \
|  \/    \ B
|  C     |
|--------+

假如A和B的中点恰好在直线CD上....
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