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\begin{mytext}

\xiaoti 等式：$\overline{\text{南京}54}=39\times \overline{1\text{市}6}$南京市恰好出现1、2、3、4、$\cdots$、9九个数字，“南京市”代表的三位数是\underline{\makebox[34mm][c]{}}。

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