题目内容
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 segmentMB into two parts
suchthat MC：CB=1：2，then the lengthof AC is 。
(英汉词典：length 长度；segment 线段；midpoint 中点；divides…into 分为，分成)
解析:略
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