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1 . 某人在超市一次性购买了20斤大米和10斤食用油,大米的价格是2.9元/斤,食用油的价格是25元/斤,则购买这两种商品的总花费可以用下列各式计算得到的是
A.![]() | B.![]() | C.![]() | D.![]() |
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2 . 已知矩阵
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ea29a03c1010dd728e933331abd062b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d024f0fc7981e44ec6070963f9e5499.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e54d782c4f5ac398acccfbd1ce3ff4.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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3 . 行列式
中第2行第1列元素的代数余子式的值为10, 则实数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd707b69a11f8de5566f23c1a2a9ff5a.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bddffc79910f16e3e2053e40eaf3337b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd707b69a11f8de5566f23c1a2a9ff5a.png)
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2019-12-09更新
|
128次组卷
|
5卷引用:上海市南汇中学2018-2019学年高二上学期期中数学试题
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4 . 方程组
的增广矩阵是_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1487e465e5bd4b2c564a269787f2746e.png)
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2019-12-09更新
|
214次组卷
|
9卷引用:上海市浦东新区2017-2018学年高二上学期期末考试数学试题
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5 . 用行列式解二元一次方程组
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/848488d2c6670eeb65625050a93e434e.png)
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6 . 若
且A=B,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edff1881635893293dd411ead8194aca.png)
_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a2cf68549faad7ece90e2c99e89bc75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44d87b824884c1e749a97cb9f0711286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1a834e359fa7c8bdbe8ebff9d0d1da8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edff1881635893293dd411ead8194aca.png)
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7 . 计算行列式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2def5c82f57507f20fde799079dac2d6.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19935d18c36e9614a88a3c1ec1326ab2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2def5c82f57507f20fde799079dac2d6.png)
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8 . 已知线性方程组的增广矩阵为
,若该方程组的解为
则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892560dcff6af9f66a3f735652f69dd7.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db4dbc95b905e124981de0e60ef8b508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e321f97b63c5648bd9937abb3b612b8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42bdccb02b9da855e223e71bed324872.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4476f6d4ae4dc2784fef450489796584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892560dcff6af9f66a3f735652f69dd7.png)
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9 . 已知实数
满足矩阵算式
则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/663a61ad241d5d874c9a9362f0ee917c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/156d6efc129f35849d8e1b514ab90cd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b09bc347fc453f8e51363f763a2effc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
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10 . 若
成等比数列,且公比是
.
(1)求
的值;
(2)根据公比
的取值,讨论方程组
的解的情况.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c27a9af7db04a611063978a7990745e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fce4c72725e50157f0a818be2ec2c594.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1353e56a1414fd16edc17ae65db447a.png)
(2)根据公比
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2724514af437e764f207fa14ca817e7.png)
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