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八年级数学：F、G是中点，怎么求FG的长？等边三角形和勾股定理
八年级数学：F、G是中点，怎么求FG的长？等边三角形和勾股定理
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136/169
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