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初中数学：若AB=BC=CD=DE=EF，∠1=75°，怎么求∠A的度数？
初中数学：若AB=BC=CD=DE=EF，∠1=75°，怎么求∠A的度数？
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112/143
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