1 . 甲、乙、丙三位同学语文、数学、外语三门课的平时、期中、期末成绩如下表所示,如果总评成绩按平时
、期中
、期末
计算,试用矩阵方法求出这三位同学每门课的总评成绩.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23466fd31d0666cb9f65dced41188359.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d4ec5b9d2f5dbd6ec1cac34dbd8e547.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bc00118b6316f277160328cf6a27a5e.png)
语文 | 数学 | 外语 | |||||||
平时 | 期中 | 期末 | 平时 | 期中 | 期末 | 平时 | 期中 | 期末 | |
甲 | |||||||||
乙 | |||||||||
丙 |
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2 . 已知
,
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d1578ca69c499a25df59f24a4f213dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c54b0a49c3a554ce899536b1bb3dd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f99639f7163f03c0d33d3f045b2d38cd.png)
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3 . ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17b6278954fb58f14075e7ad20170d03.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17b6278954fb58f14075e7ad20170d03.png)
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4 . 矩阵
,
,如果
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c889eba5ca1ca4994cfa47089435d76.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1de47ec43f43216020fd9090006495b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c310436493ed20b948cbcdaf903aab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46a70d32c64918aa4d1d9d3ce0bdbf7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c889eba5ca1ca4994cfa47089435d76.png)
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5 . 矩阵
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65b56181fd53e8bb9b94853b0d71ad40.png)
_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2af87867f1de9d1a56a8c39edffcef05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac62d6940800184a6426aacfcb10c297.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65b56181fd53e8bb9b94853b0d71ad40.png)
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6 . ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dfd8e7abcb82dceac14a8099a013d5d.png)
_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dfd8e7abcb82dceac14a8099a013d5d.png)
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7 . ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eecfcd5a2e87f48092b49384697c4b1.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eecfcd5a2e87f48092b49384697c4b1.png)
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8 . 方程组
中系数行列式的值为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5999813907d3430976346bd2f84c5df.png)
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9 . 方程组
的系数矩阵是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17e4cfec82d6889ab27ba5dae94698a3.png)
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10 . 方程组
的增广矩阵是_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6020c5cc6bfaa3dddb92b508807154d4.png)
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