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BD平分∠ABC，AD=CD，怎么证明∠A+∠C=180°？先构造三角形全等
已知BD平分∠ABC，AD=CD，如何证明∠A+∠C=180°？先构造三角形全等是关键。
初中数学，三角形全等，考试常见，培优专题41/133
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