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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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