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In right Fig.£¬if the length of the segment AB is 1£¬M is the midpoint
of the segment AB£¬and point C divides the segment MB into two parts
such that MC£ºCB=1£º2£¬then the length of AC is ¡£
(Ó¢ºº´Êµä£ºlength ³¤¶È£»segment Ï߶Σ»midpoint Öе㣻divides¡into ·ÖΪ£¬·Ö³É)
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