Question

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       。

   (英漢詞典：length 長度；segment 線段；midpoint 中點；divides…into 分為，分成)

 

 

Answer 1

 解析:略