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八年级数学：怎么说明BE=EF=FC？等边三角形，线段垂直平分线考题
八年级数学：怎么说明BE=EF=FC？等边三角形，线段垂直平分线考题
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62/143
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