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八年级数学：怎么证DENM是菱形？正方形边长是4，怎么求EC的长？
八年级数学：怎么证DENM是菱形？正方形边长是4，怎么求EC的长？
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190/254
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