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八年级数学：尺规作图，BD垂直平行线，判定BEDF是什么四边形？
八年级数学：尺规作图，BD垂直平行线，判定BEDF是什么四边形？
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43/254
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