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八年级数学：怎么求1/2AP+PD的最小值？ 菱形中的胡不归问题
八年级数学：怎么求1/2AP+PD的最小值？ 菱形中的胡不归问题
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174/254
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