已知实数
,
,
满足
,则当
取得最小值时,
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/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbea56925020ca1438b9bceea7140dc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d47815a0e7ccb1ea3fd76ea9ccebf33e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2021-11-23 15:08:11
|
【知识点】 求二次函数的值域或最值
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单选题
|
适中
(0.65)
解题方法
【推荐1】在平行四边形ABCD中,
,边AB、AD的长分别为2、1,若M、N分别是边BC、CD上的点,且满足
,则
的最大值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c3a1f1a37e69b2dc06bf0affd58f22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a78ca0cca2f04c7edb66b8ada06b43ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12e6f0e94393fc6bbd9b4b83ede534ac.png)
A.2 | B.3 | C.4 | D.5 |
您最近一年使用:0次
单选题
|
适中
(0.65)
解题方法
【推荐2】在
中,
是线段
上的点,则
的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20aa150042df197893898b787eeb9f3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e9bf55e322b607282d7ae1eb84c8c9b.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
|
适中
(0.65)
【推荐3】已知函数
,其中
,若函数
的最大值记为
,则
的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87245ee9ad1b30ab26415a79ec70631f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c65735db704c976419788826815a7315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1987ecbd076d89da5ef1e2561d79d857.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1987ecbd076d89da5ef1e2561d79d857.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次