数学试题讲解

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D_{n} = | \begin{array}{cccc} 1 + a_{1} & a_{1} & \dots & a_{1} \\ a_{2} & 1 + a_{2} & a_{2} \\ ⋮ & ⋮ & ⋮ \\ a_{n} & a_{n} & \dots & 1 + a_{n} \end{array} |