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第一节 二阶与三阶行列式 PowerPoint PPT Presentation


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第一节 二阶与三阶行列式. 线性代数. 扬州大学数学科学学院. 一、二阶行列式的引入. 用消元法解二元线性方程组. 方程组的解为. 由方程组的四个系数确定. 由四个数排成二行二列(横排称行、竖排 称列)的数表. 定义. 即. 二阶行列式的计算. 对角线法则. 主对角线. 副对角线. 对于二元线性方程组. 若记. 系数行列式. 则二元线性方程组的解为. 注意 分母都为原方程组的系数行列式. 例 1. 解. 二、三阶行列式. 定义. 记. ( 6 )式称为数表( 5 )所确定的 三阶行列式. . 列标. 行标. 三阶行列式的计算.

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第一节 二阶与三阶行列式

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