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八年级数学：直角三角形，E是BC上的动点，怎么求DE的取值范围？
八年级数学：直角三角形，E是BC上的动点，怎么求DE的取值范围？
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86/169
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