給圓規把圓周4等份 不可用直尺
Forum » 數學討論 / 幾何 » 給圓規把圓周4等份 不可用直尺
Started by: 123456 (guest)
Date: 15 Jun 2009 03:22
Number of posts: 3
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給圓規把圓周4等份 不可用直尺
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