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八年级数学：怎么求矩形对角线AC的长？矩形性质，线段垂直平分线
八年级数学：怎么求矩形对角线AC的长？矩形性质，线段垂直平分线
初中数学，等腰三角形，等边三角形，线段垂直平分线，培优专题115/143
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