2013·北京西城·二模
解题方法
1 . 已知正数
满足
,
,则
的取值范围是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/132bc768c61ab195768601a0be02222a.png)
![](https://img.xkw.com/dksih/QBM/2013/8/28/1571327941476352/1571327946964992/STEM/ff8bd7433c004de9b0001e2bf345faa2.png?resizew=96)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
您最近一年使用:0次
2011·四川宜宾·二模
解题方法
2 . 设x,y满足约束条件
,若目标函数
的最大值为5,则
的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dded1cf4948f5fc814527b39f625541a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ef585486cab9ba889ec0f06596254e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57f879f6e8df7d5fb261328806260b3.png)
A.5 | B.6 | C.7 | D.8 |
您最近一年使用:0次
10-11高三·四川成都·阶段练习
解题方法
3 . 设
,
满足约束条件
,若目标函数
的最大值为6,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/c2f848c7a9b0ac62063c8f479c53874a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d05efc3026b7bd0dbc4a58525f91b876.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f80687ee31fada0b8c849595b3e4067f.png)
A.1 | B.3 | C.2 | D.4 |
您最近一年使用:0次
4 . 已知实数
满足
,则
的最大值为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0fffbec1fe851795dfdd448bf0d165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31a7bcb1cff822c60d363ba37adb5e83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b88584cf1df43e28d03592c7998b1653.png)
您最近一年使用:0次