1 . 已知![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47815720489d303ac3cadc22b20cff0a.png)
_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47815720489d303ac3cadc22b20cff0a.png)
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2 . ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02d42440e9b7e2407a80376b2b69e43c.png)
_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02d42440e9b7e2407a80376b2b69e43c.png)
您最近一年使用:0次
3 . 已知
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26a46e7879436d532af3f4b6e258a81.png)
______ ;![](https://staticzujuan.xkw.com/quesimg/Upload/formula/450406e17a9b33a778e0b3d57d9ac253.png)
_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66580d34441a974652e0a45a4354e335.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a7ef7136d4e27bc2bc6553afaab8093.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26a46e7879436d532af3f4b6e258a81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/450406e17a9b33a778e0b3d57d9ac253.png)
您最近一年使用:0次
4 . 已知
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/579754296e38f32e183c528184af6e68.png)
_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f02c80de86c86578cf1b444c7bc8163.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73c607acac0d9f8efe7702b5d768c8ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/579754296e38f32e183c528184af6e68.png)
您最近一年使用:0次
5 . 某电器商场销售的彩电、U盘和
播放器三种产品.该商场的供货渠道主要是甲、乙两个品牌的二级代理商.今年9月份,该商场从每个代理商处各购得彩电100台、U盘52个、
播放器180台.而10月份,该商场从每个代理商处购得的产品数量都是9月份的1.5倍.现知甲、乙两个代理商给出的产品单价(元)如下页表中所示:
(1)计算
,并指出结果的实际意义;
(2)用矩阵求该商场在这两个月中分别支付给两个代理商的购货费用.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b51ce5aa90b3b9bdadde649b8cea85b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b51ce5aa90b3b9bdadde649b8cea85b.png)
彩电 | U盘 | ![]() | |
甲代理商单价(元) | 2350 | 1200 | 750 |
乙代理商单价(元) | 2100 | 920 | 700 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/234f41daf97e431fa1da0b9a350e5bb7.png)
(2)用矩阵求该商场在这两个月中分别支付给两个代理商的购货费用.
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6 . ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a753aea2c89e1d76507bec83c2442aa3.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a753aea2c89e1d76507bec83c2442aa3.png)
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7 . 已知
,
,其中
,若
,
求(1)
的值;
(2)
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bba412a7f946516b045f6c0b1963c7e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cde114a78b6b04a17b2a38709ddb9b12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12f102439ebd1efd422f04209ecec2bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46a70d32c64918aa4d1d9d3ce0bdbf7b.png)
求(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9c1f914da4657eca7865982b130b299.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
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8 . 下列选项中不能作为方程组
有唯一解的充要条件的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a65bd6cdc598a67059dc4293a1694dc0.png)
A.![]() ![]() | B.![]() ![]() |
C.![]() | D.![]() |
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9 . 方程组
有唯一解,则
的值不可以是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca5f5e624f7b41e31750fe2c11a6692a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
10 . 已知
矩阵
、
与实数
、
,下列运算不一定成立的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0abc7b7ef8b7a91099ca63ea1aaf7cfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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