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八年级：怎么求PQ的值？矩形的性质，三角形中位线，真的好简单
八年级数学：怎么求PQ的值？矩形的性质，三角形中位线，真的好简单。
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131/254
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