数学试题讲解

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计算

D_{2 n} = | \begin{array}{lllllll} a_{n} & b_{n} \\ ⋱ & . \\ a_{1} & b_{1} \\ c_{1} & d_{1} \\ . & ⋱ \\ c_{n} & d_{n} \end{array} |

未写的元素都是0