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八年级数学：AD是三角形角平分线，∠B=2∠C，怎么求证AB+BD=AC？
八年级数学：AD是三角形角平分线，∠B=2∠C，怎么求证AB+BD=AC？
初中数学，三角形角平分线，基础训练，培优专题13/57
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