问题标题:
行列式1234-21-433-4-1243-2-1计算行列式1234-21-433-4-1243-2-1
问题描述:
行列式1234-21-433-4-1243-2-1
计算行列式1234
-21-43
3-4-12
43-2-1
陈颖文回答:
|1234|①
|-21-43|②
|3-4-12|③
|43-2-1|④
=
|1234|
|05211|(②②+①×2)
|0-10-10-10|(③③-①×3)
|0-5-14-17|(④④-①×4)
=
|5211|②
|-10-10-10|③×1
|-5-14-17|④
=
|5211|
|0-612|(③③+②×2)
|0-12-6|(④④+②)
=
|-612|
|-12-6|×5
=180×5
=900
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