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初中数学：若AC=7，FC=3，怎么求OC的值？等边三角形，添加辅助线
初中数学：若AC=7，FC=3，怎么求OC的值？等边三角形，添加辅助线
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117/143
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