数学试题讲解

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下列个项中是 4 阶行列式一项的为

- a_{21} a_{13} a_{34} a_{42}

- a_{11} a_{21} a_{33} a_{42}

- a_{31} a_{12} a_{13} a_{44}

- a_{14} a_{21} a_{32} a_{41}