If the midpoint of the 12cm segment AB is m, and point C divides the segment MB into MC: CB = 1:2, then the length of the segment AC is______ ．

The midpoint of ∵ line AB is m, ∵ am = BM = 6cm, let MC = x, then CB = 2x, ∵ x + 2x = 6, the solution is x = 2, that is, MC = 2cm. ∵ AC = am + MC = 6 + 2 = 8cm

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