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八年级数学：怎么判定AD与AB的位置关系？倍长中线，再用勾股定理
八年级数学：怎么判定AD与AB的位置关系？倍长中线，再用勾股定理
初中数学，直角三角形，勾股定理及逆定理，基础训练，培优专题124/169
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