1 . 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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2 . 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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3 . 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)
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4 . 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)
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5 . 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)
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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
6 . 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)
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7 . 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)
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8 . 在
中,角A、B、C的对边分别为a、b、c,若
,则角A的大小为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1ba88bf979183632e7d26670bbecbe.png)
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9 . 已知行列式
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb8cc25dc1f79ea88d3c377780b95b0e.png)
________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac4b297f5a53a79fbed1c513984bd220.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb8cc25dc1f79ea88d3c377780b95b0e.png)
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2020-12-02更新
|
99次组卷
|
2卷引用:上海市位育中学2021届高三上学期期中数学试题
10 . 若实数a、b、c、d满足矩阵等式
,则行列式
的值____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5b2fe4437dab8c17b332f3256407fa8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b29320f184b4027471a2951527457453.png)
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