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八年级数学：当CP长为多少时，B的对应点M正好落在△DEP的边上？
八年级数学：当CP长为多少时，B的对应点M，正好落在△DEP的边上？
八年级数学：平行四边形，矩形，菱形，正方形，三角形中位线培优29/254
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