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例如

性质6 把行列式的某一列(行)的 各元素乘以同一个数然后加另一列(行) 对应的元素上去,行列式不变. 例如. 三、用行列式的性质 计算行列式. 例1 计算. 例2. 计算. 解:. 例3 计算. 解: 从倒数的二行开始,把前一行的(-1)倍加到后一行上去 。. 同理,可得:. 例4 计算. 解 :把所有 列 都加到 第一列 上去,然后,从 第一列 提取 公因子 ,再把第二、三、四行都减去 第一行 。. 作业. 4. (1) (2) 5. (2)(3).

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例如

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  1. 性质6 把行列式的某一列(行)的 各元素乘以同一个数然后加另一列(行) 对应的元素上去,行列式不变. • 例如

  2. 三、用行列式的性质计算行列式 • 例1 计算

  3. 例2. 计算

  4. 解:

  5. 例3 计算

  6. 解: 从倒数的二行开始,把前一行的(-1)倍加到后一行上去。

  7. 同理,可得:

  8. 例4 计算

  9. 解:把所有列都加到第一列上去,然后,从第一列提取公因子,再把第二、三、四行都减去第一行。解:把所有列都加到第一列上去,然后,从第一列提取公因子,再把第二、三、四行都减去第一行。

  10. 作业 4. (1) (2) 5. (2)(3)

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