真题
1 . 若x,y满足约束条件
则z=3x-y的最小值为_________ .
![](https://img.xkw.com/dksih/QBM/2012/7/6/1570917599387648/1570917604622336/STEM/f5d3265f56384be0bec99c7512ebd1bf.png?resizew=90)
![](https://img.xkw.com/dksih/QBM/2012/7/6/1570917599387648/1570917604622336/STEM/8f5e11931e194181b2679f74791e2a97.png?resizew=233)
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2 . 已知实数
、
满足约束条件
且目标函数
既有最大值又有最小值,那么实数
的取值范围是__________________ .
![](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/7b3559b9475f6a7e43c052b9f9868c42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee51b0cac927e6445e4b94438c2ff3da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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3 . 设变量
,
满足约束条件
则目标函数
的最大值为__________ .
![](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/fe375ab3a668d4c3c89426cef097f878.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f7c99486743e17633d086d868f0680c.png)
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2018-05-24更新
|
797次组卷
|
2卷引用:【市级联考】四川省达州市2018届高三第四次模拟数学(文)试题
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4 . 若使得满足约束条件
的变量x,y表示的平面区域为正方形,则可增加的一个约束条件为___________ .
①x+y≤4②x+y≥4③x+y≤6④x+y≥6
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcd853b3c0a496486252279c685fa99f.png)
①x+y≤4②x+y≥4③x+y≤6④x+y≥6
您最近一年使用:0次
2021-06-01更新
|
265次组卷
|
2卷引用:云南省昆明市第一中学2021届高三第九次考前适应性训练数学(文)试题
5 . 若
,
满足约束条件
,则
的最小值为___________ .
![](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/144a644e074e4c2275166c286c6fee93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89a1b9ede2f13c7aebce20945105e18.png)
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6 . 设x,y满足约束条件
,则z=
的最大值是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d886d756d06355c5e6f1aec2b900168.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd7fd94465d2eb97e7b202cb78285827.png)
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7 . 在直角坐标系
中,记
表示的平面区域为
,在
中任取一点
,
的概率![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fc5a5e974137451f6511688b5bafd04.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad74123cad28b67f8c6912c766b7ec12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f14cc5b1bf746ed13cca432dcba086e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c44ef271c9497b829c549ce8aa3d5990.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c44ef271c9497b829c549ce8aa3d5990.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a87f0b0e255c8866dd2845da85f3a1e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d005434adec2da4c056534241d91d434.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fc5a5e974137451f6511688b5bafd04.png)
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2019-03-16更新
|
416次组卷
|
3卷引用:【市级联考】广东省江门市2019届高三高考模拟(第一次模拟)考试数学(理科)试题
8 . 已知点
,动点
的坐标满足条件
,则
的最小值是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32366143230ca122894a4bada7c7b96d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aee82283f06cedef32eb15b87964f5d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a2582ff52b4a6dff1888dce14dcb91f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d063ec7f9dbeba72fabf4437f9400e07.png)
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9 . 若点
在不等式
表示的平面区域内,则实数
的取值范围是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4157726dc056734b4e611f26f4e22c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdca678b01c5532f4ebaa4b94c601c74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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2021-12-10更新
|
165次组卷
|
2卷引用:河南省濮阳市第一高级中学2021-2022学年高二上学期期中质量检测数学(文)试题
10 . 已知实数
满足
则
的最小值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0fffbec1fe851795dfdd448bf0d165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35c22073450e006fe92c39e9bda7d84d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f7c99486743e17633d086d868f0680c.png)
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