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九年级数学：怎么求证△ADE∽△ACB？怎么求BD的长？三角形相似
九年级数学：怎么求证△ADE∽△ACB？怎么求BD的长？三角形相似
初中数学，线段成比例，三角形相似，中考数学培优专题83/116
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