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八年级：点O运动到何处，AECF是矩形？满足什么条件，是正方形？
八年级：点O运动到何处，AECF是矩形？满足什么条件，是正方形？
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91/254
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