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Math problem: there are three points a, B and C on a straight line in order, ab = 50cm, BC = 20cm, point P is the midpoint of the line AC, find the length of the line BP
Math problem: there are three points a, B and C on a straight line in order, ab = 50cm, BC = 20cm, point P is the midpoint of the line AC, find the length of the line BP
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