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八年级数学：若△ABD直角三角形，怎么求∠ADC的度数？没图要讨论
八年级数学：若△ABD直角三角形，怎么求∠ADC的度数？没图要讨论
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108/169
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