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ÎåµÈ·ÖÊÇÕýÈ·µÄ, (2k+1)µÈ·Ö(±ÈÈç,k=3) ´íµÄºÜÆæÝâ.

ÎåµÈ·Ö, A=(1,0),
, I=(0,1), ÓÚÊÇ ,

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, ËùÒÔÊÇÕýÎå±ßÐÎ.

ºóÃæÄǸöÕýn±ßÐÎ×ö·¨Ö±½ÓºÍGauss ³ÉÃû¶¨Àíì¶Ü, ËùÒÔÒ»¶¨Óдí. (²»ÒªÎÊÎÒ, ÎÒÒ²²»ÖªµÀ´íÔÚÄÄÀï)
A regular n-gon can be constructed with compass and straightedge if n is the product of a power of 2 and any number of distinct Fermat primes (including none).

×¢Òâ, ÈËÀൽĿǰΪֹҲ²ÅÕÒµ½5¸ö·ÑÂíËØÊý, 3, 5, 17, 257, 65537. ËùÒÔÕý7±ßÐξø¶Ô²»Êdz߹æ×öͼ¿ÉÒÔʵÏÖµÄ.
We_must_know. We_will_know.
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