1 . 已知
,
的最小值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca27cc54ca0332245f5167488daa3408.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a861406a1c1f251aa4df7226c60ce125.png)
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2 . 利用基本不等式求最值
已知
,
,则:
(1)如果和
等于定值s,那么当
时,积xy有最大值______ ;
(2)如果积xy等于定值p,那么当
时,和
有最小值______ .
已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/061813f1ec633c5c4c393c4de7938322.png)
(1)如果和
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b88584cf1df43e28d03592c7998b1653.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07b9d5aaaceaa3ac514d17fcfefbf9b4.png)
(2)如果积xy等于定值p,那么当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07b9d5aaaceaa3ac514d17fcfefbf9b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b88584cf1df43e28d03592c7998b1653.png)
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2024高三·全国·专题练习
解题方法
3 . 若函数
在
处取最小值,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c986d6e9b73d9b08cf2e6fe25177a43f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54b53b86bd516400d6fa7dabb3603f31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
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解题方法
4 . 已知
,则
的最小值为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fde64f4d3c38e43fbdee24eadc4b0dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb88c835e6f2478e3fbf5970a17bd003.png)
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5 . 若不等式
在
上恒成立,则实数t的取值范围是__________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dba68f613d8f8916f3b4a0e2aee73cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58e82c4003d20b36777f7aea584e3dd4.png)
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名校
6 . 已知
,则
的最小值是_________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fde64f4d3c38e43fbdee24eadc4b0dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5aaf168e030d76af938d89c1bb4633f7.png)
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2024-01-24更新
|
797次组卷
|
2卷引用:陕西省西安市鄠邑区2023-2024学年高一上学期期末考试数学试题
名校
7 . 函数
(
)的最小值是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8da5f20ea9eced706950f6d60a498e19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
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8 . 已知
,
,且
,则
的最小值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ca5fd57c2c2fcc3c7a574fdd1467d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edc3dcafd542131ec7e63a3acf73165d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98dc1af5c23150f6950585074634ec10.png)
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名校
9 . 已知
,则当![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
_____ 时,
取最小值为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e66b2a6604560f30cf6789d958b8cbdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
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10 . 已知
,则
在![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
______ 时,取得最小值为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cee9c95fffa3b6c8db3acb5a837fdf7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
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