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初中数学：怎么求DF⊥BC？等腰三角形，三线合一辅助线，学浪计划
初中数学：怎么求DF⊥BC？等腰三角形三线合一，添加辅助线很常用
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108/143
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