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八年级数学：怎么求证AC-AB=2BE？等腰三角形，三线合一，经典题
八年级数学：怎么求证AC-AB=2BE？等腰三角形，三线合一，经典考题。
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78/143
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