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初中数学：等腰直角三角形，若∠CDE=45°，怎么求BE/BC的值？
初中数学：等腰直角三角形，若∠CDE=45°，怎么求BE/BC的值？
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101/143
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