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初中数学：怎么求EF的长？平行四边形，等腰三角形性质，芜湖一模
初中数学：怎么求EF的长？平行四边形，等腰三角形性质，芜湖一模
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195/254
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