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1 . 已知矩阵
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26a46e7879436d532af3f4b6e258a81.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be60aac917a425530bb75f1e2f3809a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f5becf2e251fd642aa5e35cfb8bd229.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26a46e7879436d532af3f4b6e258a81.png)
您最近一年使用:0次
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2 . 行列式
中,元素4的代数余子式的值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/732a46ddc0dbe8a694998886dad540d4.png)
您最近一年使用:0次
2020-12-04更新
|
132次组卷
|
2卷引用:上海市控江中学2020-2021学年高二上学期期中数学试题
名校
3 . 已知关于
、
的方程组
,
为常数,且
.
(1)写出此方程组的系数矩阵;
(2)解此方程组.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/671afef8db94741a7256e3194a438e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2725a89d93c791f7a0098f4964587905.png)
(1)写出此方程组的系数矩阵;
(2)解此方程组.
您最近一年使用:0次
4 . 线性方程组的增广矩阵为
解为
,则三阶行列式
值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc2f5fbd996eaa0ee83a8b03e9ebd74c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d16e32287eea185bb1113f4c6a42603.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b3c6eb5bcedd2af1b18cfc1e3d84762.png)
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5 . 若全集
,且不等式
的解集为A,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/715476727accc3c6b3c71f2f25c3aaad.png)
____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a64dc61989ca50b9ee19d835c4ed268.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea5581c58da494babc90145da4de4425.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/715476727accc3c6b3c71f2f25c3aaad.png)
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6 . 关于
、
的二元线性方程组
的增广矩阵经过变换,最后得到的矩阵为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/934d37c81b2266c7b86bcc11afaf5f91.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbdf69d50dffe8bdae2580c7e71e5eae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f26767c2e9097931dc4c0c5cdb23d7b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/934d37c81b2266c7b86bcc11afaf5f91.png)
您最近一年使用:0次
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7 . 已知
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26a46e7879436d532af3f4b6e258a81.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c97a5bc3447232182b769992efe8248c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90f12969403db37bb2010f9b0416ed3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26a46e7879436d532af3f4b6e258a81.png)
您最近一年使用:0次
8 . 行列式
中元素3的代数余子式的值为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/691c9b88cdf1cc3ad2879d836f047e01.png)
您最近一年使用:0次
2020-12-03更新
|
42次组卷
|
2卷引用:上海市曹杨二中2020-2021学年高二上学期期中数学试题
9 . 已知
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b5b8ac661edbca9ad5d1dcbececd90c.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c97a5bc3447232182b769992efe8248c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4ae200f06d3d7e53adfe7282cabd36e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b5b8ac661edbca9ad5d1dcbececd90c.png)
您最近一年使用:0次
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10 . 已知函数
,在7行7列的矩阵
中,
,则这个矩阵中所有数之和为_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c031ffb791dee52ca53fec7ece0730c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f3a25e36e9b17c8cf2e926a50476fee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecda7ab9f3cba4d614b52893246f0b14.png)
您最近一年使用:0次