As shown in the figure, ab = CD, CB = 1 / 3AB, points m and N are the midpoint of AB and CD respectively, and Mn = 8cm Anyway, there are two answers. What should I do In silence

MN=MB+CN-CB=AB/2+CD/2-AB/3=2/3AB
AB=3/2MN=3/2*8=12cm

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