2019高三·全国·专题练习
名校
1 . 已知实数
,
满足
,则
的最大值是__________ .
![](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/b7f08b38c93382377928dbfe4f24f453.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7397a79cfd8a2f12c47a7c34c1c1cba9.png)
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2 . 已知实数
,
满足
,则
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/9acd7a98a45b46fe03470243e11e7130.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a125cb40ab3d54de9f3a444032af5e4.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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3 . 已知实数
,
满足不等式组
,则
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/c13cb73d88ac2441acfd87abef6e9819.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc6aa1de808b498b0edddac62126b9b8.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2019-06-02更新
|
279次组卷
|
3卷引用:2019届湖南省湘潭市高三第三次模拟文科数学试题
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4 . 已知变量
满足约束条件
,则
的取值范围是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0fffbec1fe851795dfdd448bf0d165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/543e147d6e71b53c47d00277e607bead.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be86135c2d33700e409da6c5951165e2.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2019-05-20更新
|
524次组卷
|
2卷引用:湖南师范大学附属中学2018-2019学年高三下学期第六次月考数学(理)试题
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5 . 已知x,y满足约束条件
,则目标函数
的最大值为__________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f8891d1827a716212984e3bb4f8e3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a125cb40ab3d54de9f3a444032af5e4.png)
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2019-05-20更新
|
312次组卷
|
2卷引用:【全国百强校】湖南省长沙市第一中学2019届高三下学期高考模拟卷(一)数学(文)试题
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6 . 若x,y满足约束条件
,目标函数
仅在点(2,0)处取得最小值,则实数a的取值范围是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a53ab0fc453a992114bfcefd6aab421e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baaa79c2c101deb8595d3b296ad2b73d.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2019-05-19更新
|
853次组卷
|
2卷引用:【全国百强校】湖师范大学附属中学2019届高三数学(文)试题
名校
7 . 若实数
,
满足约束条件
,则
的最大值是________ .
![](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/c9e32c144ec889f98043189a72627997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1995404eb114809bc18fbdb4f1388b2.png)
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2019-05-12更新
|
817次组卷
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6卷引用:湖南省益阳市桃江县第一中学2020-2021学年高二下学期入学考试数学试题
8 . 已知
,若
恒成立,则
的取值范围是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/769204df7cd5dc5b18ffb198d1538af1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24230aa9b8a037013ed31d0481aab39e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
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9 . 已知实数
满足条件
,则
的最大值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0fffbec1fe851795dfdd448bf0d165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acdb875ada0ac9eecf94bc6d04409ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ee4ff51bc02334212b87e608870469b.png)
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2019-04-29更新
|
309次组卷
|
2卷引用:【市级联考】湖南省株洲市2019届高三第二次教学质量检测(二模)数学(理科)试题
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10 . 已知实数
满足约束条件:
,若
只在点
处取得最小值,则
的取值范围是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0fffbec1fe851795dfdd448bf0d165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/345e42ccb1403a78c5ea8fdcf836f4aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f2f54897ba501b74846ac6c84b919ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/238f0ea276a00ae8d681ce00cc11c8ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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