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七年级数学：如何判断AO和BC的关系？等腰三角形，三线合一
七年级数学：如何判断AO和BC的关系？等腰三角形，三线合一，你还记得吗？
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72/143
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