数学试题讲解

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D = | \begin{array}{ccccc} 1 + a_{1} & 1 & 1 & \dots & 1 \\ 1 & 1 + a_{2} & 1 & \dots & 1 \\ \dots \\ 1 & 1 & 1 & \dots & 1 + a_{n} \end{array} |