回复：ZT：平面上7个点（3星）

来源: jjmmjj 于 2009-07-03 06:52:26 [] [旧帖] [给我悄悄话] 阅读数 : (226 bytes)

A. 3 points form a triangle with each edge of 1.
B. 4 points form a square with each edge of 1.
place A and B at a plane separated far enough that any point in one group to any point of another group is large than 1.

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